Gaya APA

Wendel, R., Gorman, W. (1988). Selling: Personal Preparation, Persuasion, Strategy Ed. 3 (Ed. 3). Amerika: Random House.

Gaya MLA

Wendel, Richard., Gorman, Walter. "Selling: Personal Preparation, Persuasion, Strategy Ed. 3". Ed. 3 Amerika: Random House, 1988. Text.