APA Citation

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

Chicago Style Citation

Drucker, Peter Ferdinand. Management Challenges for the 21st Century. New York: HarperCollins, 1999.

MLA Citation

Drucker, Peter Ferdinand. Management Challenges for the 21st Century. New York: HarperCollins, 1999.

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