United States Library of Congress. Classification Division. (1956). Classification. Class P, subclass PJ-PM: Languages and literatures of Asia, Africa, Oceania, America, mixed languages, artificial languages, with supplementary pages. U. S. Government Printing Office.
Cita Chicago (17th ed.)United States Library of Congress. Classification Division. Classification. Class P, Subclass PJ-PM: Languages and Literatures of Asia, Africa, Oceania, America, Mixed Languages, Artificial Languages, with Supplementary Pages. Washington: U. S. Government Printing Office, 1956.
Cita MLA (9th ed.)United States Library of Congress. Classification Division. Classification. Class P, Subclass PJ-PM: Languages and Literatures of Asia, Africa, Oceania, America, Mixed Languages, Artificial Languages, with Supplementary Pages. U. S. Government Printing Office, 1956.