Library of Congress. Copyright Office. U.S. Copyright Renewals 1950 - 1977.
Chicago Style (17th ed.) CitationLibrary of Congress. Copyright Office. U.S. Copyright Renewals 1950 - 1977.
MLA (9th ed.) CitationLibrary of Congress. Copyright Office. U.S. Copyright Renewals 1950 - 1977.
Warning: These citations may not always be 100% accurate.