Cita APA

Covey, S. R. (1991). Principle-centered leadership. New York: Simon and Schuster.

Chicago Style Citation

Covey, Stephen R. Principle-centered Leadership. New York: Simon and Schuster, 1991.

Cita MLA

Covey, Stephen R. Principle-centered Leadership. New York: Simon and Schuster, 1991.

Atenció: Aquestes cites poden no estar 100% correctes.