Thinking, Fast and Slow – Daniel Kahneman
The Right It - Alberto Savoia
The Mom Test - Rob Fitzpatrick
Combining these and your chances of success have just increased by 500%
Lean Startup should be number 1 on your list. Then, Talking to Humans and Mom Test.
I like simple books like BlitzScaling which touches topics like PMF lightly while painting a birds eye-view of a lot of other related things.
Also, not a book but sir david skok's breakdown of saas metrics might also help.
- https://www.youtube.com/watch?v=bCBccKfG9U0
- https://www.forentrepreneurs.com/saas-metrics-2/