APA Citation

Drucker., P. F. (1999). Management challenges for the 21st century. New York: HarperBusiness.

Trích dẫn kiểu Chicago

Drucker., Peter F. Management Challenges for the 21st Century. New York: HarperBusiness, 1999.

MLA Citation

Drucker., Peter F. Management Challenges for the 21st Century. New York: HarperBusiness, 1999.

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