The Richest Man In Babylon great bookThe Richest Man In Babylon - Most of the non-fiction books are insanely repetitive, that's not the case with this book.
Chanakya Neeti - A book about politics, behaviour, strategy, and much more - it's available in English.
I would add The Glass Beat Game and SteppenwolfIf you like short books i would recomend you Demian, by Hermann Hesse.
Is this more towards meditation?Living in the Light by Shakti Gawain