The exception being the absolutely brilliant book How to Get Rich by Felix Dennis, who sadly died a few years back (leaving a fortune of £500m). It was recommended to me by a friend’s dad who himself runs a successful business and uses it as a kind of a reference book.
I'm reading How To Get Rich by Felix Dennis, an entrepreneur who was estimated to be worth several hundred million dollars (he died in 2014). He didn't write the book to make money off its sales, but to give his brutally honest view on how to become ultra wealthy, so it's an interesting read. I purchased the ebook, but you can find a PDF copy by googling.