APA استشهاد

Heyel, K. (1973). encyclopedia of management (2nd ed.). Van Nostrand Reinhold Company.

استشهاد بنمط شيكاغو

Heyel, Karl. Encyclopedia of Management. 2nd ed. New York: Van Nostrand Reinhold Company, 1973.

MLA استشهاد

Heyel, Karl. Encyclopedia of Management. 2nd ed. Van Nostrand Reinhold Company, 1973.