Cita APA (7th ed.)
Drucker, P. F. (2007). The essential Drucker: Selections from the management works of Peter F. Drucker (Classic Drucker Collection ed.). Elsevier.
Cita Chicago (17th ed.)
Drucker, Peter F. The Essential Drucker: Selections from the Management Works of Peter F. Drucker. Classic Drucker Collection ed. Oxford, UK: Elsevier, 2007.
Cita MLA (9th ed.)
Drucker, Peter F. The Essential Drucker: Selections from the Management Works of Peter F. Drucker. Classic Drucker Collection ed. Elsevier, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.