Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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