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  • Maxwell, John C. (2010). In Everyone Communicates Few Connect: What the Most Effective People Do Differently. Nashville, Tenn: Thomas Nelson.
  • Sandler, David. (1995). In You Can’t Teach a Kid to Ride a Bike at a Seminar. USA: Bayhead.
  • Clarke, Boyd; Crossland, Ron. (2002). In The Leader’s Voice. New York, NY: The Tom Peters Press and SelectBooks.