Willingham, R. (1997). The people principle: A revolutionary redefinition of leadership. St. Martins press.
芝加哥风格引文Willingham, Ron. The People Principle: A Revolutionary Redefinition of Leadership. New York: St. Martins press, 1997.
MLA引文Willingham, Ron. The People Principle: A Revolutionary Redefinition of Leadership. St. Martins press, 1997.
警告：这些引文格式不一定是100％准确.