Three of his books, The 21 Irrefutable Laws of Leadership, Developing the Leader Within You, and The 21 Indispensable Qualities of a Leader, have each sold over a million copies.
Tiga bukunya, The 21 Irrefutable Laws of Leadership, Developing the Leader Within You, dan The 21 Indispensable Qualities of a Leader masing-masing telah terjual lebih dari satu juta kopi.