APA Edition Citation

Drucker, P. F. (1999). Management challenges for the 21st century / Peter F. Drucker. HarperBusiness.

Chicago Edition Citation

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

MLA Edition Citation

Drucker, Peter F. Management Challenges for the 21st Century / Peter F. Drucker. HarperBusiness, 1999.

Warning: These citations may not always be 100% accurate.