Cita APA (7a ed.)

Drucker, P. F. (2002). Management challenges for the 21st century. Butterworth Heinemann.

Cita Chicago Style (17a ed.)

Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth Heinemann, 2002.

Cita MLA (9a ed.)

Drucker, Peter F. Management Challenges for the 21st Century. Butterworth Heinemann, 2002.