APA (7th ed.) Zitazioa

Library of Congress. Copyright Office. U.S. Copyright Renewals, 1951 July - December.

Chicago Style (17th ed.) Zitazioa

Library of Congress. Copyright Office. U.S. Copyright Renewals, 1951 July - December.

MLA (9th ed.) Zitazioa

Library of Congress. Copyright Office. U.S. Copyright Renewals, 1951 July - December.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.