Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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