Willingham, R. (1997). The people principle: A revolutionary redefinition of leadership. St. Martins press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWillingham, Ron. The People Principle: A Revolutionary Redefinition of Leadership. New York: St. Martins press, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWillingham, Ron. The People Principle: A Revolutionary Redefinition of Leadership. St. Martins press, 1997.
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