Παραπομπή APA

Williamson, C. D. (1963). Executive operations technique. Prentice hall.

Παραπομπή Chicago Style

Williamson, C. Don. Executive Operations Technique. New Jersey: Prentice hall, 1963.

Παραπομπή MLA

Williamson, C. Don. Executive Operations Technique. Prentice hall, 1963.