APA-viite (7. p.)

Drucker, P. F. (2001). Management Challenges for the 21st Century. HarperCollins Publishers.

Chicago-viite (17. p.)

Drucker, Peter F. Management Challenges for the 21st Century. New York: HarperCollins Publishers, 2001.

MLA-viite (9. p.)

Drucker, Peter F. Management Challenges for the 21st Century. HarperCollins Publishers, 2001.