If you are talking about the seminar content. Admittedly, its not original (written in 1910) but the source is considered a classic and has been used by Rockefeller, Edison, Ford etc.
It is not without controversy though but explore for yourself.
If you are talking about the seminar content. Admittedly, its not original (written in 1910) but the source is considered a classic and has been used by Rockefeller, Edison, Ford etc.
It is not without controversy though but explore for yourself.