Mandino, O. (1968). The greatest salesman in the world. Frederick Fell.
Lua i Stíl Chicago (17ú heag.)Mandino, Og. The Greatest Salesman in the World. New York: Frederick Fell, 1968.
Lua MLA (9ú heag.)Mandino, Og. The Greatest Salesman in the World. Frederick Fell, 1968.
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