Cita APA (7th ed.)

Drucker, P. (2006). Management challenges for the 21st Century. Palgrave Macmillan Punl.

Cita Chicago (17th ed.)

Drucker, Peter. Management Challenges for the 21st Century. New York: Palgrave Macmillan Punl, 2006.

Cita MLA (9th ed.)

Drucker, Peter. Management Challenges for the 21st Century. Palgrave Macmillan Punl, 2006.