Cohen, W. A. (1990). The art of the leader. Prentice Hall.
Cita Chicago (17th ed.)Cohen, William A. The Art of the Leader. Englewood Cliffs, N.J: Prentice Hall, 1990.
Cita MLA (9th ed.)Cohen, William A. The Art of the Leader. Prentice Hall, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.