Cita APA

Covey, S. R. (1990). Principle centered leadership. New York: Simon & Schuster.

Chicago Style Citation

Covey, Stephen R. Principle Centered Leadership. New York: Simon & Schuster, 1990.

Cita MLA

Covey, Stephen R. Principle Centered Leadership. New York: Simon & Schuster, 1990.

Atenció: Aquestes cites poden no estar 100% correctes.