APA
Hunter J. C., . (2004). The world's most powerful leadership principle. Colorado: Waterbrook press.
Chicago
Hunter James C, . 2004. The world's most powerful leadership principle. Colorado: Waterbrook press.
Harvard
Hunter J. C., . (2004). The world's most powerful leadership principle. Colorado: Waterbrook press.
MLA
Hunter James C, . The world's most powerful leadership principle. Colorado: Waterbrook press. 2004.