A classic in the Math field is How to Solve It by Georg Polya https://www.amazon.com/How-Solve-Mathematical-Princeton-Science/dp/069111966X https://www.amazon.

A classic in the Math field is How to Solve It by Georg Polya https://www.amazon.com/How-Solve-Mathematical-Princeton-Science/dp/069111966X https://www.amazon.com/How-Solve-Mathematical-Princeton-Scie... And for improving statistical thinking, the classic How to Lie With Statistics by Darrell Huff https://www.amazon.com/How-Lie-Statistics-Darrell-Huff-ebook/dp/B00351DSX2/ https://www.amazon.com/How-Lie-Statistics-Darrell-Huff-ebook...