.Drucker, P. F. (2000). Management challenges for the 21st century. Butterworth-Heinemann.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र.Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्र.Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 2000.
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