Παραπομπή APA

Gellerman, S. W. (1963). Motivation and productivity. American management.

Παραπομπή Chicago Style

Gellerman, Saul W. Motivation and Productivity. America: American management, 1963.

Παραπομπή MLA

Gellerman, Saul W. Motivation and Productivity. American management, 1963.