APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.