Drucker, P. F. (2011). The essential Drucker: Selections from the management works of Peter F. Drucker (1st Collins Business Essentials pbk. ed.). Routledge.
استشهاد بنمط شيكاغوDrucker, Peter F. The Essential Drucker: Selections from the Management Works of Peter F. Drucker. 1st Collins Business Essentials pbk. ed. London: Routledge, 2011.
MLA استشهادDrucker, Peter F. The Essential Drucker: Selections from the Management Works of Peter F. Drucker. 1st Collins Business Essentials pbk. ed. Routledge, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.