Here are two books I've enjoyed
Systems Thinking: https://amzn.to/2y43BaO
. Shows how most situations in life we face require a larger perspective, to see them as a complicated system. Contains many good references to systems thinking
How to Solve it: https://amzn.to/2sR1Jw4
A book by a mathematician (Polya), which tells you how to think about problems in a way that you can generalize to any type of life situation
Edit: Sorry, fixed the second link