MANDINO, O. (1978). The greatest salesman in the world. Bantam Books.
Lua i Stíl Chicago (17ú heag.)MANDINO, OG. The Greatest Salesman in the World. Toronto: Bantam Books, 1978.
Lua MLA (9ú heag.)MANDINO, OG. The Greatest Salesman in the World. Bantam Books, 1978.
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