Cita APA (7th ed.)

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.