Hill, N. (1977). Success through positive mental attitude. Pocket book.
Chicago-čujuhus (17. p.)Hill, Napoleon. Success Through Positive Mental Attitude. New York: Pocket book, 1977.
MLA-čujuhus (9. p.)Hill, Napoleon. Success Through Positive Mental Attitude. Pocket book, 1977.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.