Library of Congress. Copyright Office. U.S. Copyright Renewals, 1952 July - December.
Chicago-čujuhus (17. p.)Library of Congress. Copyright Office. U.S. Copyright Renewals, 1952 July - December.
MLA-čujuhus (9. p.)Library of Congress. Copyright Office. U.S. Copyright Renewals, 1952 July - December.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.