APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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