Hill, Napoleon (1937). Think and Grow Rich. Chicago, Illinois: Combined Registry Company. ISBN1-60506-930-2. A similar quote regarding Thomas Edison is on page 230.{{cite book}}: CS1 maint: postscript (link)
"President of Lumber Company Is Missing". The Pensacola Journal. Pensacola, Florida. October 17, 1908 – via Chronicling America: Historic American Newspapers, Library of Congress.