Παραπομπή APA

Schiffman, S. (2009). Sales presentation techniques; That reality work.

Παραπομπή Chicago Style

Schiffman, Stephan. Sales Presentation Techniques; That Reality Work. Adams Media Corporation, Avon, 2009.

Παραπομπή MLA

Schiffman, Stephan. Sales Presentation Techniques; That Reality Work. 2009.