Dyfyniad APA

Library of Congress. Copyright Office. U.S. copyright renewals: Artwork 1965-1977.

Dyfyniad Arddull Chicago

Library of Congress. Copyright Office. U.S. Copyright Renewals: Artwork 1965-1977.

Dyfyniad MLA

Library of Congress. Copyright Office. U.S. Copyright Renewals: Artwork 1965-1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.