United States Library of Congress. (1995). Subject headings (18th ed.). Library of Congress, Cataloging Distribution Service.
芝加哥风格引文United States Library of Congress. Subject Headings. 18th ed. Washington, D.C: Library of Congress, Cataloging Distribution Service, 1995.
MLA引文United States Library of Congress. Subject Headings. 18th ed. Library of Congress, Cataloging Distribution Service, 1995.
警告：这些引文格式不一定是100％准确.