Παραπομπή APA

Robbins, H. A. (1992). How to speak and listen effectively. American Management Association.

Παραπομπή Chicago Style

Robbins, Harvey A. How to Speak and Listen Effectively. New York: American Management Association, 1992.

Παραπομπή MLA

Robbins, Harvey A. How to Speak and Listen Effectively. American Management Association, 1992.