APA引文

Covey, S. R. (2002). Principle centered leadership. Pocket books.

Chicago Edition Citation

Covey, Stephen R. Principle Centered Leadership. London.: Pocket books, 2002.

MLA引文

Covey, Stephen R. Principle Centered Leadership. Pocket books, 2002.

警告：這些引文格式不一定是100％准確.