Cita APA (7th ed.)
Drucker, P. F. (1999). Management challenges for the 21st century. Butterworth-Heinemann.
Cita Chicago (17th ed.)
Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.
Cita MLA (9th ed.)
Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.