Library of Congress. Classification Division & Voegelein, L. B. (1947). Classification. Class A, general works, polygraphy (3rd edition.). U. S. Government Printing Office.
Citace podle Chicago (17th ed.)Library of Congress. Classification Division a L. Belle Voegelein. Classification. Class A, General Works, Polygraphy. 3rd edition. Washington: U. S. Government Printing Office, 1947.
Citace podle MLA (9th ed.)Library of Congress. Classification Division a L. Belle Voegelein. Classification. Class A, General Works, Polygraphy. 3rd edition. U. S. Government Printing Office, 1947.
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