Beatty, J., & Drucker, P. F. (1998). The world according to Peter Drucker. Universities Press.
Cita Chicago (17th ed.)Beatty, Jack, i Peter F. Drucker. The World According to Peter Drucker. New York ; india: Universities Press, 1998.
Cita MLA (8th ed.)Beatty, Jack, i Peter F. Drucker. The World According to Peter Drucker. Universities Press, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.