By Napoleon Hill
By Helen Tupper, Sarah Ellis
By Philippa Davies
By Carol A. O'Connor
By DK, Robert Heller
By John Viney, Stephanie Jones
By David McMullan
By Mark Forstater
By GEORGE MAHER
By Welch, Jack
By Yvonne James Furth, Molly Rudberg-Leshnock
By Graham Wettone
By Covey
By Carnegie
By Susan Jones
By Martin Birchall
By John Marks Templeton
By Tom H. Smith, Roger Connors
By Martyn Lewis
By Joe Vitale (Hypnotic Marketing, Inc., Wimberley, TX)
By Richard Templar
By Paul Wallace
By Michael Heppell
By James M. Kouzes (Emeritus, Tom Peters Company), Barry Z. Posner (Leavey School of Business and Administration and Santa Clara University)
By Herminia Ibarra
By Carol S. Dweck
By Judith Johnstone
By Andrew Aziz
By Terence Jackson
By Jean Marie Stine