Intertextuality is the meaning of the text that is formed by other texts. It means the formation of a new text based on contemporary or previous texts, so that the new text is a compact of a number of texts, the border between which is blurred, and its structure is renewed in a new way, so that nothing is left of the previous texts except its substance, and its essence is in the new text is hidden and only experts can recognize it. No text can be understood on its own without relying on other texts, because it is impossible to avoid using expressions and things that others have already used. Therefore, intertextuality shows that all events are somehow related to previous events and benefit from them. Intertextuality idea is emerged effectively in various operations of librarianship. Although it is a relative modern idea, despite its history and librarians’ awareness of the idea, intertextual relationships have been implicitly circulating in professional librarianship operations, either intrinsically or ideally, so the position of the idea can be traced in practices of this field. This papar aims to represent three technical aspects in information science and librarianship including Collection develpement, cataloging and information retrieval from an intertextual perspective.