APA način citiranja (7. izdanje)
Drucker, P. F. (1999). Management challenges for the 21st century. Butterworth-Heinemann.
Čikaški stil citiranja (17. izdanje)
Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.
MLA način citiranja (9. izdanje)
Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 1999.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.