Drucker., P. F. (1999). Management challenges for the 21st century. New York: HarperBusiness.
Chicago Style CitationDrucker., Peter F. Management Challenges for the 21st Century. New York: HarperBusiness, 1999.
MLA CitationDrucker., Peter F. Management Challenges for the 21st Century. New York: HarperBusiness, 1999.
Warning: These citations may not always be 100% accurate.