Library of Congress & Subjet Cataloging Division. (2007). Subject Headings (30th. ed.). The National Bibliographic Service.
芝加哥风格引文Library of Congress 与 Subjet Cataloging Division. Subject Headings. 30th. ed. Washington: The National Bibliographic Service, 2007.
MLA引文Library of Congress 与 Subjet Cataloging Division. Subject Headings. 30th. ed. The National Bibliographic Service, 2007.
警告：这些引文格式不一定是100％准确.