Mandino, O. (1968). The Greatest Saleman in the world. Bantam Books.
Lua i Stíl Chicago (17ú heag.)Mandino, O.G. The Greatest Saleman in the World. New York: Bantam Books, 1968.
Lua MLA (9ú heag.)Mandino, O.G. The Greatest Saleman in the World. Bantam Books, 1968.
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