Haas, K. B. (1962). Professional salesmanship; persuasion and motivation in marketing. Holt, Rinehart and Winston.
Citace podle Chicago (17th ed.)Haas, Kenneth Brooks. Professional Salesmanship; Persuasion and Motivation in Marketing. New York: Holt, Rinehart and Winston, 1962.
Citace podle MLA (9th ed.)Haas, Kenneth Brooks. Professional Salesmanship; Persuasion and Motivation in Marketing. Holt, Rinehart and Winston, 1962.
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