Psychology

>>7653665
How to make Friends and Influence People
Art of the Deal
The Game
10 tips to manipulate and exploit other people
The Prince

>>7653679
Don't forget:

Rich Dad, Poor Dad
How to Make a Million Bucks: The American Way
How to be Alpha!: 10 Quirky Tips to be the Man
Running the Street: 8 Wacky Tips On How to Invest like the Best

>>7653665
give them the redpill

Reeve's Understanding Emotion and Motivation (or however it's called in English) could be useful, particularly the explanation of intrinsic and extrinsic motivation, and why you shouldn't punish children, but also why rewarding them, for example, with candy, isn't the best idea either.
As for self betterment, Feeling Good by dr. Burns can help you learn to deal with dysfunctional thoughts.

>>7653716
>Feeling Good
This one is good. It's a bit repetitive so feel free to skim past the boring bits if you feel like you understand the main point of that section