Adedibu, L.O. (2008). Catalogue use by science students in the University of Ilorin, Ilorin, Nigeria. Libri: International Journal of Library and Information Services, 58(1): 58-62.
Adenike, O. and Akin, O.T. (2014). Online public access catalogue (OPAC) in Nigerian libraries- a case study of the Kenneth Dike library and University Oflagos library. Ozean Journal of Social Sciences, 6(3): 55-65.
Adigun, A., Ojo, G., Salvador-Olayokun, S., Yewande, M., Abdulazeez, M. and Babatunde, O. (2013). An assessment of online public access catalogue (OPAC) utilization in two selected university libraries in Lagos State, Nigeria. Information Manage, 11(1-2): 85-90.
Ahma, H. (2014). Library Software Awareness: A Survey of OPAC vs. Card Catalogue in IIT Delhi, IIT Kanpur and Kashmir University. DESIDOC Journal of Library and Information Technology, 34 (4): 325-332.
Ahmad, H., Mushtaq, M. and Imran, S.M. (2012). The use of search strategies in OPAC- A comparative study of Central Library, IIT Delhi, P.K. Kelkar Library, IIT Kanpur and Allama Iqbal Library, Kashmir University. International Research Journal of Library and Information Science, 2(2): 170-183.
Ajala, I.O. and Aderinto, C.O. (2010). Catalogue use in Ladoke Akintola University of technology library Ogbomoso Nigeria. Journal of Cataloguing and Classification Quarterly, 49(1): 33-41.
Ali, N. (2005). The use of electronic resources at IIT, Delhi library- A study of search behavior. The Electronic Library, 23(6): 691-700.
Ansari, M.A. and Amita, (2008). Awareness and use of OPAC in five Delhi libraries. The Electronic Library, 26(1): 111-129.
Ariyapala, P.G. and Edzan, N.N. (2002). Foreign postgraduate students and the online catalogue at the University of Malaya library. Malaysian Journal of Library and Information Science, 7(1): 57-67.
Babu, K.S. and Naidu, P.G. (2011). Use of online public access catalogue (OPAC) facility by the university users: a survey. International Journal of Library and Information Studies, 1(2): 40-47.
Babu, R.B. and O’Brien, A. (2000). Web-OPAC interfaces- An overview. The Electronic Library, 18(7): 316-327.
Bamidele, I.A., Omeluzor, S.U.,Onoyeyan, G. and Aluko-Arowolo, T.K. (2013). Faculty Members’ Awareness and Use of Online Public Access Catalog (OPAC) Services at Babcock University, Nigeria- A Study. Information and Knowledge Management, 4(11): 29-37.
Beheshit, J. (1992). Browsing through public access catalogue. Information Technology and Libraries, 11(3): 220-227.
Bennett, J. (2007). OPAC design enhancement and their effects on circulation and resource sharing with the library consortium environment. Information Technology and Libraries, 36(1): 53-57.
Borgman, C.L. (1996). Why are online catalog still hard to use. Journal of the American Society for Information Science, 47(7): 449-453.
Brown, C. (2004). Knowing where they are going- Statistics for online government document access through the OPAC. Online Information Review, 28(6): 396-409.
Chintha, N. (2013). A study of web-based OPACs services in India. E-Library Science Research Journal, 1(4): 1-6.
Cho, J. (2006). A study on the application method of the functional requirements for the bibliographic records (FRBR) to the online public access catalog (OPAC) in Korean University Libraries. Library Collection, Acquisitions and Technical Services, 30(3and4): 202-213.
Cho, J. (2006). A study on the model to link the Korean University Library OPAC with search portals. The Electronic Library, 25(5): 575-584.
Devendra and Nikam, K. (2014). Use of OPAC in Law University Libraries of South India- A Study. Journal of Indian Library Association, 50(3): 5-14.
Devendra and Nikam, K. (2013). Attitudes of Law University Library users towards the use of OPAC/web OPAC in Andhra Pradesh: A Study. SRELS Journal of Information Management, 50 (3): 327-335.
Dinet, J., Favart, M. and Passerault, J.M. (2004). Searching for information in an online public access catalogue (OPAC) - the impacts of information search expertise on the use of Boolean operators. Journal of Computer Assisted learning20: 338–346.
Ebiwolate, P.B. (2010). The Use of the Library Catalogue by Undergraduate Students in Niger Delta University Library" (2010). Library Philosophy and Practice (e-journal). Paper 392. http://digitalcommons.unl.edu/libphilprac/392
Eileen, C.M. (2003). Using a web OPAC to deliver digital collections. Online Information Review, 27(1): 28-36.
Elahe, K.Z., Gheorghita, G. and Sherry, Y.C. (2008). A user perception of online public library catalogues. International Journal of Information Management, 28(6): 492-502.
Elsbernd, M.E.R., Compbell, N.F. and Wesley, T.L. (1990). The best of OPAC instruction: A selected guide for the beginner. Research Strategies, 8(1): 28-36.
Emiri, O.T. (2015). Influence of demographic factors and use of online public access catalogue (OPAC) by undergraduates in selected university libraries in Southern Nigeria. International Journal of Scientific and Technology Research, 4(7): 164-169.
Eugenie, N.G., Patrick, L.O. and Tam, O. (2006). Web-OPAC and selected databases: a comparative study of the searching effectiveness and efficiency.Journal of East Asian Libraries, Number 139.
Fabunmi, O.M. and Asubiojo, B.O. (2013). Awareness and use of online public access catalogue by students of Obafemi Awolowo University, Ile-Ife, Nigeria. Library Philosophy and Practice (e-journal). Paper 922. http://digitalcommons.unl.edu/libphilprac/922
Fati, O.L and Adetimirin, (2015). OPAC awareness as a factor affecting OPAC use by Undergraduates in two Nigerian libraries. International Journal of Academic Library and Information Science, 2(3): 72-80
Gohain, Anajan and Saikia, Mukesh. (2013). Use and users satisfaction on online public access catalogue (OPAC) services among B.Tech. students of school of engineering in Tezpur University: a survey. Library Philosophy and Practice (e-journal), paper 990. http://www.digitalcommons.unl.edu/libphilpract/990.
Guha, T.K. and Saraf, V. (2005). OPAC usability: assessment through verbal protocol. The Electronic Library, 23(4): 463-473.
Gupta, S.P. (2002). Statistical Methods, 31st edn. Sultan Chand and Sons, New Delhi, India.
Hussain, A. and Raja, M.M. (2002). Online public access catalogue: Its development and limitations. IASLIC Bulletin, 47(4): 26-32.
Iqbal, M. (2014). Use of online public access catalogue (OPAC) by the users in NISCAIRE and NASSDOC library- A comparative study. Dissertation, Delhi, Aligarh Muslim University, Aligarh, India.
Islam, M. (2010). The Use of the Library Catalogue by Undergraduates. Library Philosophy and Practice (e-journal), paper 489. http://digitalcommons.unl.edu /libphilprac/489
Jalaja, V., Veeran MCK, and Koovakai, D. (2004). Organization, Processing and use of information in the digital era: Prof. M. Parameswaran Festschrift. Ess Ess Publications, New Delhi, India.
Jayakanth, F., Sharada, B. and Minj, F. (2007). An OAI-based approach to build and maintain union catalogue of OPACs. In: Proceedings of the International Conference on Semantic Web and Digital Libraries at ICSD, 21-23 February 2007, Bangalore, India.
Kani-Zabihi, E., Ghinea, G. and Chen, E.Y. (2008). User perception of online public access library catalogues. International Journal of Information Management, 28(6): 492-502.
Kannapanavar B.U. and Manjunatha, K.V. (2010). Library use pattern by the faculty members of the engineering colleges in Karnataka: A study. International Journal of Library and Information Science,2(8): 155-163,
Kapoor, K. and Goyal, O.P. (2007). Web-based OPACs in Indian academic libraries- A functional comparison. Programme Electronic Library and Information Systems, 41(3): 291-309.
Kaur, H. and Sharda, P. (2010). Role of technological innovations in improving library services. International Journal of Library and Information Science, 2(1): 11-16.
Kaur, K. and Kathuria, K. (2015). Use of OPAC in Bhai Kahn Singh Nabha Library, Punjabi University Patiala- A Case Study. International Journal of Information Dissemination and Technology, 5(2): 80-86.
Kaur, T. (2004). Use of library catalogue of Punjabi University Library. Library and Information Science, 1(5): 521-25.
Krishnamoorthy, M. (2000). Online public access catalog through LibSys- An experience. DRTC Annual Seminar on Electronic Sources of Information, 1(3): 56-62.
Kumar, A. (2014). Use patterns of OPAC among the faculty members in Great Lakes Institute of Management at Chennai- A case study. Research Spectra,1(2): 36-45.
Kumar, P. and Mahajan, P. (2015). Use and usage of OPAC in public libraries in Chandigarh City (India): a study. SRELS Journal of information Management. 52(3): 32-39.
Kumar, R. (2013). Usability of online public access catalogue in Kurukshetra University and Panjab University libraries- a comparative study. In: Emerging Trends in Library and Information Science, Ess-Ess Publication, New Delhi: 262-278.
Kumar, R., Singh, J. and Singh, B. (2014). Use of OPAC in Nehru library, CCSHAU, Hisar. In: 59th ILA International Conference on Managing libraries in the changing information world: from surviving to thriving at IIT Roorkee, 21-23, February 2014, Uttarakhand.
Kumar, S. and Vohra, R. (2011). Online public access catalogue usage at Panjab University Library, Chandigarh. DESIDOC Journal of Library and Information Technology, 31(4): 302-310.
Kumar, S. and Bansal, J. (2012). Evaluation and comparison of features of OPACs in university libraries of Chandigarh and Punjab, India. IASLIC Bulletin, 57(3): 157-169.
Kumar, S. (2011). Effect of web searching on the OPAC: A comparison of selected university libraries. Library Hi Tech News, 28(6): 14-28.
Kumar, S. (2012). Impact of internet search engines on OPAC users: a study of Punjabi University, Patiala, India. Program, 46(1): 56-70.
Kumar, S. (2016). Use of online public access catalogue in central library of Kurukshetra University, Kurukshetra. In: Transformation of Library Services in Electronic Era (Eds. Partap, Bhanu, Kumar, Rajinder and Singh, Balwan) Studera Press, New Delhi, pp. 301-310.
Kumbar, S.S. and Mallaiah, T.Y. (2008). Changing pattern of user expectations regarding the library catalogue as an information retrieval tool- a case study of Mangalore University. Annals of Library and Information Studies, 55(1): 7-16.
Lakshmi, S.R., Chinasamy, K., Balasubramanian, P. and Muthuraj, R. (2013). A study on the use of online public access catalogue (OPAC) by students and faculty members of Unnamalai Institute of Technology in Kovilpatti (Tamil Nadu). International Journal of Library and Information Studies, 3(1): 17-26.
Lamborde, S.V. and Kristine, S.C. (2000). Empowering users with a new online catalog. Library Hi-Tech, 18(2): 130-141.
Lew, K.P., Chennupati, K.R. and Foo, S. (2004). Heuristic-based user interface evaluation at Nanyang Technological University in Singapore. Program, 38(1): 42-59.
Li, H. and Deng, S. (2007). Location and shelf mapping from OPAC search results: with reference to Wichita State university. New Library World, 109(3and4): 107-116.
Madhusudhan, M. and Aggarwal, S. (2011). Web‐based online public access catalogues of IIT libraries in India- an evaluative study. Program, 45(4): 415-438.
Madhusudhan, M. (2012). Use of web-based online public access catalogue by the Foreign Students at the University of Delhi. World Digital Libraries- An International Journal, 5(2): 43-58.
Malliari, A. and Kyriaki-Mannessi, D. (2007). Users behavior pattern in academic libraries’ OPACs: A multivariate statistical analysis. New Library World, 108(3and4): 107-122.
Mehtab, Alam and Amita. (2008). Awareness and use of OPAC in five Delhi libraries. The Electronic Library,26(1): 111-129.
Moore, S. (2006). What are the factors that the influence the public’s use of OPAC? University of Sheffield [cited on 7.5.2010]. http://dagda.shef.ac.uk/dissertations/2005-06/External/Moore_ Sarah_MALib.pdf.
Mulla, K.R. and Chandershekhara, M. (2009). Access of Web-OPAC in engineering college libraries in Karnataka- A survey. SERLS Journal of Information Management, 46(3): 321-332.
Narang, A. and Singh, S. (2013). Use of Online Pubic Access Catalogue by the research scholars of Guru Nanak Dev University, Amritsar: A Study. SRELS Journal of Information Management, 50(2): 191-200.
Nath, A. and Sharma, A. (2006). Use of online public access catalogue by the research scholars in Panjab University Library, Chandigarh - A survey. Library Herald, 44(3): 212-222.
Oduwale, A.A., Oyesiku, F.A. and Labulo, A.A. (2002). Online public access catalogue (OPAC) use in Nigerian Academic Libraries: A case study from the University of Agriculture, Abeokuta. Library Herald, 40(1): 20-27.
Oliva, V.T. (2000). Bringing federal documents to the forefront for library users: Selective cataloguing using OPAC. College and Research Libraries, 61(6): 555-564.
Onuoha, U.D., Umahi, F.O. and Bamidele, I.A. (2013). Use and satisfaction with online public access catalogue in selected university libraries in Ogun State, Nigeria. Information and Knowledge Management, 3(11): 1-5.
Ortiz-Repiso, V., Bazan, V., Ponnsati, A. and Cottereau, M. (2006). How researchers are using the OPAC of the Spanish Council for scientific research library network. The Electronic library, 24(2): 190-211.
Owolabi, K.A. and Salaam, M.O. (2011). A survey of catalogue use by engineering students in Nigerian Universities. Cataloging and Classification Quarterly, 49(3): 233-241.
Papadakis, L., Stefanidakis, M. and Tzali, A. (2008). Visualizing OPAC subject headings. Library Hi Tech, 26(1): 19-23.
Park, I. (1997). A comparative study of major OPACs in selected academic libraries- users study and subjective user evaluation. International Information and Library Review, 29(1): 67-83.
Peng, L.K., Ramaiah, C.K. and Foo, S. (2004). Heuristic-based user interface evaluation at Nanyang Technological University in Singapore. Program: Electronic Library and Information System, 38(1): 42-59.
Qadri, U. (2012). OPAC as document retrieval tool: a case study of the University of Kashmir. International Journal of Digital Library Services, 2(2): 8-18
Rajput, P.S., Naidu, G.H.S. and Jadon, G.S. (2008). Use of online public access catalogue in Devi Ahilya University Library, Indore. SERLS Journal of Information Management, 45(1): 55-62.
Ramesh Babu, B. and Tamizhcheivan, M. (2003). An investigation into the features of OPAC in Tamilnadu (India). Library Review, 52(6): 257-267.
Ravichandran, P. and Balasubramani, R. (2008). Use of online public access catalogue by the research scholars in Annamalai University Library. Indian Journal of Information, Library and Society, 21(3&4): 144-149.
Ravichandrarao, I.K. (1983). Quantitative Methods for Library and Information Science. Willey Eastern, New Delhi, India.
Ruzegea, M. (2012). The Usability of OPAC Interface Features: The Perspective of Postgraduate Students at International Islamic University Malaysia (IIUM). Library Philosophy and Practice. http://www.webpages.uidaho.edu/~mbolin/ ruzegea.htm
Sangam, S.L. and Hadimani, M.B. (2004). Use of Online Public Access Catalogue by the research scholars in Karnatak University Library, Dharwad. IASLIC Bulletin, 49(3): 162-170.
Sawant, S., Singh, R.V. and Dhole, R. (2012). The study of use of OPAC by the students of various universities of Mumbai and Navi Mumbai districts of India. Journal of Library, Information and Communication Technology, 5(1&2): 45-52.
Shivakumaraswmay, K.N. and Narendra, B.K. (2016). Use and Users Satisfaction on online public access catalogue (OPAC) services in BGS Institute of Technology- A Survey. International Journal of Library and Information Studies, 6(2): 142-150.
Si, Li and Wanigasooriya, P.L. (2015). An Investigation and Analysis of Online Public Access Catalogues (OPACs) in University Libraries in Sri Lanka. European International Journal of Science and Humanities, 1(7): 13-28.
Smith, E.T. (2003). Assessing collection usefulness: An investigation of library ownership of the resources graduate students use. College and Research Libraries, 64(5): 1-12.
Somashekara, Y.L., Raju, C. and Jayana, R. (2014). Online public accessible catalogue (OPAC): A study of Mysore university library OPAC. International Journal of Library Science and Research, 4(4): 57-64.
Sridhar, M.S. (2004a). OPAC vs. card catalogue: A comparative study of user behavior. The Electronic Library, 22(2): 175-183.
Sridhar, M.S. (2004b). Subject searching in the OPAC of a special library: problems and issues. OCLC Systems and Services: International Digital Library Perspectives, 20(4): 183-191.
Sujatha, (2014). OPAC- the library space saver: a study on OPAC usage in KULW, Telangana. In: The International Conference on Library Space-Content Management for Networked Society, Dharmaram Vidya Kshetram, Bangalore, 18-20 October 2014.
Thanuskodi, S. (2008). Use of the internet and e-resources for legal information- A case study. Indian Journal of Library and Information science, 2(3): 133-137.
Thanuskodi, S. (2012). Use of online public access catalogue at Annamalai university library. International Journal of Information Science, 2(6): 70-74.
Urmani, A., Nagarkar, S. and Jagtap, V.K. (2007). Usability testing: Study of three Web-OPACs from three different countries [Cited 26.07.2008] from http//www.useit.com/papers/ golcomposition.html
Veena, G., Mallaiah, T.Y. and Pushpalatha, K. (2012). Use and awareness of online public access catalogue (OPAC) facility by users of SVS College Library, Bantwala, Mangalore- A study. International Journal of Library and Information Studies, 5(4): 65-71.
Velmurugan, V.S. and Amudha, G. (2012). Usage patterns of OPAC among faculty members in Indian colleges. Mass Communicator: International Journal of Communication Studies. 6(3): 37-40.
Villén-Rueda, L., Senso, J.A. and de Moya-Anegón, F. (2007). The use of OPAC in a large academic library: A transactional log analysis study of subject searching. The Journal of Academic Librarianship, 20(20): 1-11.
Virginia, O.R., Virginia, B., Ponsati, A. and Cottereau, M. (2006). How researchers are using the OPAC of the Spanish Council for Scientific Research Library Network.The Electronic Library, 24(2): 190-211.
Whisnant, L.A. (2003). Search strategies used by fiction readers with emphasis on usage of the Online Public Access Catalog- A survey of Wake County Public Library Patrons. In: A Master’s paper for the M.S. in L.S. degree, April 2003, 55p.
Xiaojuan, Z. and Na, N. (2012). The gap between users and cataloging- description and analysis of survey data in Chinese Academic Library [Cited on 26.08.2016] http://conference.ifla.org/ifla78
Yushiana, M. and Rani, W.A. (2007). Heuristic evaluation of interface usability for a web‐based OPAC. Library Hi Tech, 25(4): 538-549.
Yusuf, F.O., and Iwu, J. (2010). Use of academic library- A case study of Covenant University, Nigeria.Chinese Librarianship: an International Electronic Journal, 30: 1-12.
Zainal, H.B. and Hussin, A.R.B.C. (2013). Model for Measuring Web OPAC end user satisfaction. Journal of Information Systems Research and Innovation, 5(2): 98-107.
The present study describes the review of literature on the usability of card catalogue, OPAC and web OPAC such as visit of the Library, awareness and use of OPAC, learning, frequency of use of OPAC, purpose of use, use of various searching options while using OPAC, satisfaction level on the use of OPAC, problems faced while using OPAC, suggestions for the improvement of OPAC System and its various features. Some national and international levels of such studies have been reviewed in this article.