Cita APA (7a ed.)
Drucker, P. F. (1999). 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, 1999.
Cita MLA (9a ed.)
Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 1999.
Precaución: Estas citas no son 100% exactas.