This paper determines the materials cited in Ph.D. theses of Sociology, submitted to the Panjab University, Chandigarh during the years 2002-2012 to improve the existing collection development policy of University library. The study reveals that Books are the most preferred sources of information used by the researchers in the field of Sociology, accounting for 57.65% of the total citations, although citations from journals, proceedings, internet resources and reports are also found. It is also observed those researchers are not taking much advantage of internet resources. Bradford's law of scattering was applied. More cited materials were contributed by single authors and degree of collaboration of books was calculated as 0.28 and the degree of collaboration of authors in cited journal articles were calculated as 0.35.