APA
Hunter J. C., . (2004). The world's most powerful leadership principle. New York: Crown Business.
Chicago
Hunter James C, . 2004. The world's most powerful leadership principle. New York: Crown Business.
Harvard
Hunter J. C., . (2004). The world's most powerful leadership principle. New York: Crown Business.
MLA
Hunter James C, . The world's most powerful leadership principle. New York: Crown Business. 2004.