APA (7th ed.) Citation

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 (9th ed.) Citation

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