Ranganathan, S. R. Prolegomena to library classification / by S. R. Ranganathan - 3rd ed. - New Delhi : Ess Ess Publications, 2006. - 640 p. ; 24cm. Includes bibliographical references and index. ISBN: 8170004691 Subjects--Topical Terms: Classification Dewey Class. No.: 025.4 / RAN/P