APA ציטוט

Drucker, P. F. (1999). Management challenges for the 21st century (First edition.). HarperBusiness.

Chicago Style (17th ed.) Citation

Drucker, Peter F. Management Challenges for the 21st Century. First edition. New York: HarperBusiness, 1999.

ציטוט MLA

Drucker, Peter F. Management Challenges for the 21st Century. First edition. HarperBusiness, 1999.