Cita APA (7a ed.)

Drucker, P. F. (2001). The essential Drucker: Selections from the management works of Peter F. Drucker. HarperCollins.

Cita Chicago Style (17a ed.)

Drucker, Peter Ferdinand. The Essential Drucker: Selections from the Management Works of Peter F. Drucker. New York: HarperCollins, 2001.

Cita MLA (9a ed.)

Drucker, Peter Ferdinand. The Essential Drucker: Selections from the Management Works of Peter F. Drucker. HarperCollins, 2001.