Super Thinking: The Big Book of Mental Models by
https://www.amazon.com/gp/product/0525533583/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0525533583&linkCode=as2&tag=tracbook-20&linkId=974399b4a98ff9d8a1687de3f0575e79
Traction: How Any Startup Can Achieve Explosive Customer Growth by Gabriel Weinberg
https://www.amazon.com/Traction-Startup-Achieve-Explosive-Customer-ebook/dp/B00TY3ZOMS