1. Hoffman Edward, The Right to be Human: A Biography of Abraham Maslow (Los Angeles, CA: Jeremy P. Tarcher, Inc., 1988), p. 280.
2. How companies define their mission
3. Schisgall Oscar, Eyes on Tomorrow: The Evolution of Proctor & Gamble (Chicago, IL: J.G. Ferguson Publishing Company, 1981), p. 260.
4. Watson Thomas J.Jr., A Business and Its Beliefs (New York, NY: McGraw-Hill Book Company, Inc., 1963), pp. 4–5.
5. DePree Max, Leadership is an Art (New York, NY: Doubleday Dell Publishing Group, Inc., 1989), pp. 4–80.