APA-referens (7:e uppl.)

U. S. Library of Congress. (1922). Classification. Class N: Fine arts (3rd ed.). U. S. Government Printing Office.

Chicago-referens (17:e uppl.)

U. S. Library of Congress. Classification. Class N: Fine Arts. 3rd ed. Washington: U. S. Government Printing Office, 1922.

MLA-referens (9:e uppl.)

U. S. Library of Congress. Classification. Class N: Fine Arts. 3rd ed. U. S. Government Printing Office, 1922.