Drucker, P. F. (2008). The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. Harper Business.
Chicago-referens (17:e uppl.)Drucker, Peter F. The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. New York: Harper Business, 2008.
MLA-referens (9:e uppl.)Drucker, Peter F. The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. Harper Business, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.