APA (7th ed.) Citation

Library of Congress. (1920). Classification: Class H, Social sciences. U.S. GPO.

Chicago Style (17th ed.) Citation

Library of Congress. Classification: Class H, Social Sciences. Washington: U.S. GPO, 1920.

MLA (9th ed.) Citation

Library of Congress. Classification: Class H, Social Sciences. U.S. GPO, 1920.

Warning: These citations may not always be 100% accurate.