Source : Acres of Diamonds, delivered over 5000 times at various times and places from 1900-1925
Russell Conwell
Adoniram Judson Gordon
Writer
Charles F. Haanel
Author
Elbert Hubbard
Writer
Florence Scovel Shinn
Writer
James Allen
Writer
Napoleon Hill
Author
William George Jordan
Essayist
William Graham Sumner
Political scientist
William Walker Atkinson
Author