APA (7th ed.) Citation

United States. Library of Congress. (1997). Library of Congress classification: H, social sciences. Library of Congress, Cataloging Dist. Service.

Chicago Style (17th ed.) Citation

United States. Library of Congress. Library of Congress Classification: H, Social Sciences. Washington, D.C: Library of Congress, Cataloging Dist. Service, 1997.

MLA (9th ed.) Citation

United States. Library of Congress. Library of Congress Classification: H, Social Sciences. Library of Congress, Cataloging Dist. Service, 1997.