Cita APA (7th ed.)

Schiffman, S. (2008). The 25 sales skills they don`t teach at business school. massachusetts Adams Media Corp.

Cita Chicago (17th ed.)

Schiffman, Stephan. The 25 Sales Skills They Don`t Teach at Business School. [s.l]: massachusetts Adams Media Corp, 2008.

Cita MLA (9th ed.)

Schiffman, Stephan. The 25 Sales Skills They Don`t Teach at Business School. massachusetts Adams Media Corp, 2008.