Schiffman, S. (2008). The 25 sales skills they don`t teach at business school. massachusetts Adams Media Corp.
Citace podle Chicago (17th ed.)Schiffman, Stephan. The 25 Sales Skills They Don`t Teach at Business School. [s.l]: massachusetts Adams Media Corp, 2008.
Citace podle MLA (9th ed.)Schiffman, Stephan. The 25 Sales Skills They Don`t Teach at Business School. massachusetts Adams Media Corp, 2008.
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