Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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