Cita APA (7th ed.)

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.

Cita Chicago (17th ed.)

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.

Cita MLA (9th ed.)

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.