Cita APA (7th ed.)

.Drucker, P. F. (2000). Management challenges for the 21st century. Butterworth-Heinemann.

Cita Chicago (17th ed.)

.Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 2000.

Cita MLA (9th ed.)

.Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 2000.