Chan, Lois Mai Library of congress subject headings: Principles and application - 4th ed. - Westport: Libraries Unlimited, 2007 - xvi, 549p. - Library and information science text series . ISBN: 81-7000-516-7 Subjects--Topical Terms: Library science Subjects--Index Terms: Library of congress Universal Decimal Class. No.: D 025.343LC / P7