Drucker. (2003). The essential drucker: The best of sixty years of Peter Drucker's essential writings on management. HarperCollins.
Chicago Style (17th ed.) CitationDrucker. The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. New York: HarperCollins, 2003.
MLA (8th ed.) CitationDrucker. The Essential Drucker: The Best of Sixty Years of Peter Drucker's Essential Writings on Management. HarperCollins, 2003.
Warning: These citations may not always be 100% accurate.