Bettger, F. (1992). How i raised myself from failure to success in selling. A Fireside Book.
Citace podle Chicago (17th ed.)Bettger, Frank. How I Raised Myself from Failure to Success in Selling. New York: A Fireside Book, 1992.
Citace podle MLA (9th ed.)Bettger, Frank. How I Raised Myself from Failure to Success in Selling. A Fireside Book, 1992.
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