The Master Key System is a personal development book that was originally published as a correspondence course in 1912. Along with "The Science of Getting Rich", by Wallace D. Wattles, the Master Key System is the source of Rhonda Byrne's inspiration for the book and the film "The Secret".

L'autore

Born in Ann Arbor, Michigan, Charles F. Haanel began his business career in St. Louis. He resigned his position in order to start his own company and eventually founded one of the largest conglomerates of his time. He also wrote Mental Chemistry and The New Psychology.

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