APA (7th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division. (1956). Classification. Class P, subclasses PJ-PM: Languages and literatures of Asia, Africa, Oceania, America, mixed languages, artificial languages. [U. S. Government Printing Office].

Chicago Style (17th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division. Classification. Class P, Subclasses PJ-PM: Languages and Literatures of Asia, Africa, Oceania, America, Mixed Languages, Artificial Languages. Washington: [U. S. Government Printing Office], 1956.

MLA (9th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division. Classification. Class P, Subclasses PJ-PM: Languages and Literatures of Asia, Africa, Oceania, America, Mixed Languages, Artificial Languages. [U. S. Government Printing Office], 1956.