APA (7th ed.) Citation

Library of Congress. Classification Division. (1951). Classification. Class L: Education (3rd ed.). U. S. Government Printing Office.

Chicago Style (17th ed.) Citation

Library of Congress. Classification Division. Classification. Class L: Education. 3rd ed. Washington: U. S. Government Printing Office, 1951.

MLA (9th ed.) Citation

Library of Congress. Classification Division. Classification. Class L: Education. 3rd ed. U. S. Government Printing Office, 1951.