Schiffman, S. (2008). The 25 sales skills they don`t teach at business school. massachusetts Adams Media Corp.
Chicagoスタイル(17版)引用形式Schiffman, Stephan. The 25 Sales Skills They Don`t Teach at Business School. [s.l]: massachusetts Adams Media Corp, 2008.
MLA(9版)引用形式Schiffman, Stephan. The 25 Sales Skills They Don`t Teach at Business School. massachusetts Adams Media Corp, 2008.
警告: この引用は必ずしも正確ではありません.