Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

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

Style de citation MLA (8e éd.)

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