Παραπομπή APA

Heyel, C. (1958). Appraising executive performance. American Management Association.

Παραπομπή Chicago Style

Heyel, Carl. Appraising Executive Performance. New York: American Management Association, 1958.

Παραπομπή MLA

Heyel, Carl. Appraising Executive Performance. American Management Association, 1958.