Cita APA (7a ed.)

Drucker, P. F. (2003). Management challenges for the 21st century (Reprint.). HarperBusiness.

Cita Chicago Style (17a ed.)

Drucker, Peter Ferdinand. Management Challenges for the 21st Century. Reprint. New York: HarperBusiness, 2003.

Cita MLA (9a ed.)

Drucker, Peter Ferdinand. Management Challenges for the 21st Century. Reprint. HarperBusiness, 2003.