Cita APA (7th ed.)

Drucker, P. F. (2008). The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. Harper Business.

Cita Chicago (17th ed.)

Drucker, Peter F. The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. New York: Harper Business, 2008.

Cita MLA (9th ed.)

Drucker, Peter F. The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. Harper Business, 2008.