APA استشهاد

Seng, R. W. (1977). Skills of selling. AMACOM.

استشهاد بنمط شيكاغو

Seng, Robert W. Skills of Selling. New York: AMACOM, 1977.

MLA استشهاد

Seng, Robert W. Skills of Selling. AMACOM, 1977.