Παραπομπή APA
National Society of Sales Training Executives. (1954). Handbook of sales training (2d ed., rev. by James H. Davis.). New York: Prentice-Hall.
Παραπομπή Chicago StyleNational Society of Sales Training Executives. Handbook of Sales Training. 2d ed., rev. by James H. Davis. New York: Prentice-Hall, 1954.
Παραπομπή MLANational Society of Sales Training Executives. Handbook of Sales Training. 2d ed., rev. by James H. Davis. New York: Prentice-Hall, 1954.
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