APA引文

Drucker, P. F. 1. (1999). Management challenges for the 21st century. Oxford: Butterworth-Heinemann.

Trích dẫn kiểu Chicago

Drucker, Peter F. 1909-. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.

MLA引文

Drucker, Peter F. 1909-. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.

警告：這些引文格式不一定是100％准確.