Manning, G., & Curtis, K. (2012). The art of leadership (4th ed.). McGraw-Hill.
Chicago Style aipamenaManning, George, and Kent Curtis. The Art of Leadership. 4th ed. New York: McGraw-Hill, 2012.
MLA aipamenaManning, George, and Kent Curtis. The Art of Leadership. 4th ed. McGraw-Hill, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.