APA (7th ed.) Citation

Library of Congress. (1915). Classification: HT social groups: Communities, classes, races; completing class H, Social sciences. U.S. GPO.

Chicago Style (17th ed.) Citation

Library of Congress. Classification: HT Social Groups: Communities, Classes, Races; Completing Class H, Social Sciences. Washington: U.S. GPO, 1915.

MLA (9th ed.) Citation

Library of Congress. Classification: HT Social Groups: Communities, Classes, Races; Completing Class H, Social Sciences. U.S. GPO, 1915.