APA (7th ed.) Citation

Library of Congress. (1980). Library of Congress subject headings (9th ed.). Library of Congress.

Chicago Style (17th ed.) Citation

Library of Congress. Library of Congress Subject Headings. 9th ed. Washington: Library of Congress, 1980.

MLA (9th ed.) Citation

Library of Congress. Library of Congress Subject Headings. 9th ed. Library of Congress, 1980.