The Master Key System
|by Charles F Haanel|
|e ISBN: 9780980659566|
The Master Key System was originally published as a 24 week correspondence course in 1912. It was later published as a book form in 1916.
In 1919, Napoleon Hill wrote Haanel a letter thanking him for The Master Key System. In the letter Hill stated, "My present success and the success which has followed my work as President of the Napoleon Hill Institute is due largely to the principles laid down in The Master-Key System."
It was also one of the two principle books which inspired the movie and best-selling book, The Secret.
By 1933 it had reportedly sold over 200,000 copies worldwide. Haanel, the author, practiced the principles he taught in The Master Key System and became a self-made success who owned several major companies.
In addition to The Master Key System, Haanel wrote other books including Mental Chemistry, which was published in 1922.
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