APA-referens (7:e uppl.)

Library of Congress. Copyright Office. U.S. Copyright Renewals, 1969 July - December.

Chicago-referens (17:e uppl.)

Library of Congress. Copyright Office. U.S. Copyright Renewals, 1969 July - December.

MLA-referens (9:e uppl.)

Library of Congress. Copyright Office. U.S. Copyright Renewals, 1969 July - December.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.