APA (7th ed.) Citation

Safir, L., & Safire, W. (1990). Leadership. Simon and Schuster.

Chicago Style (17th ed.) Citation

Safir, Leonard, and William Safire. Leadership. New York: Simon and Schuster, 1990.

MLA (9th ed.) Citation

Safir, Leonard, and William Safire. Leadership. Simon and Schuster, 1990.