APA (7th ed.) Citation

United States Library of Congress. Classification Division. (1950). Classification. Class H: Social sciences (3rd ed.). U. S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States Library of Congress. Classification Division. Classification. Class H: Social Sciences. 3rd ed. Washington: U. S. Government Printing Office, 1950.

MLA (9th ed.) Citation

United States Library of Congress. Classification Division. Classification. Class H: Social Sciences. 3rd ed. U. S. Government Printing Office, 1950.