Ravilious, C. P., & United Nations Educational Scientific and Cultural Organization. (1975). A survey of existing systems and current proposals for the cataloguing and description of non-book materials collected by libraries: With preliminary suggestions for their international co-ordination. Unesco.
Chicago Style (17. basım) AtıfRavilious, C. P., ve United Nations Educational Scientific and Cultural Organization. A Survey of Existing Systems and Current Proposals for the Cataloguing and Description of Non-book Materials Collected by Libraries: With Preliminary Suggestions for Their International Co-ordination. Paris: Unesco, 1975.
MLA (9th ed.) AtıfRavilious, C. P., ve United Nations Educational Scientific and Cultural Organization. A Survey of Existing Systems and Current Proposals for the Cataloguing and Description of Non-book Materials Collected by Libraries: With Preliminary Suggestions for Their International Co-ordination. Unesco, 1975.