Cita APA

Covey, S. R. (1991). Principle centered leadership. New York: A Fireside.

Chicago Style Citation

Covey, Stephen R. Principle Centered Leadership. New York: A Fireside, 1991.

Cita MLA

Covey, Stephen R. Principle Centered Leadership. New York: A Fireside, 1991.

Atenció: Aquestes cites poden no estar 100% correctes.