Παραπομπή APA

Copeland, M. T. (1957). Executive at work. Has vald university press.

Παραπομπή Chicago Style

Copeland, Melvin T. Executive at Work. Cambridge: Has vald university press, 1957.

Παραπομπή MLA

Copeland, Melvin T. Executive at Work. Has vald university press, 1957.