APA引文

Drucker., P. F. (1999). Management challenges for the 21st century. New York: HarperBusiness.

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：這些引文格式不一定是100％准確.