APA (7th ed.) Citation

United States Library of Congress Classification Division. (1957). Classification. Class P, subclass PB-PH: Modern European languages, with supplementary pages. U. S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States Library of Congress Classification Division. Classification. Class P, Subclass PB-PH: Modern European Languages, with Supplementary Pages. Washington: U. S. Government Printing Office, 1957.

MLA (9th ed.) Citation

United States Library of Congress Classification Division. Classification. Class P, Subclass PB-PH: Modern European Languages, with Supplementary Pages. U. S. Government Printing Office, 1957.