Citazione Stile APA (7a Edizione)

Drucker, P. F. (1999). Management challenges for the 21st century. Butterworth-Heinemann.

Citazione stile Chigago Style (17a edizione)

Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.

Citatione MLA (8a ed.)

Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 1999.