Cita APA (7th ed.)

Willingham, R. (1997). The people principle: A revolutionary redefinition of leadership. St. Martins press.

Cita Chicago (17th ed.)

Willingham, Ron. The People Principle: A Revolutionary Redefinition of Leadership. New York: St. Martins press, 1997.

Cita MLA (9th ed.)

Willingham, Ron. The People Principle: A Revolutionary Redefinition of Leadership. St. Martins press, 1997.