APA引文

Covey, S. R. (1991). Principle-Centred Leadership. Pocket Books.

Chicago Style (17th ed.) Citation

Covey, Stephen R. Principle-Centred Leadership. London: Pocket Books, 1991.

MLA引文

Covey, Stephen R. Principle-Centred Leadership. Pocket Books, 1991.

警告：這些引文格式不一定是100％准確.