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I think the first book was very useful for me. It contains many interesting concepts on which I learned to do business. The fifth book is very useful not only for business, but for life. The rest of the books are very narrow-minded.

I've got that first one somewhere I believe. The only one I've read is The Wealthy Barber and the only useful advice there was to save 10% of your income.

Maybe you're right. This tip is really useful :)