APA (7th ed.) Citation

Drucker. (2001). Management challenges for the 21stcentury. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Drucker. Management Challenges for the 21stcentury. New York: HarperCollins Publishers, 2001.

MLA (8th ed.) Citation

Drucker. Management Challenges for the 21stcentury. HarperCollins Publishers, 2001.

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