In the systems thinking network group on LinkedIn, John Evans shared his book

He gives the caveat “It’s a bit dense, terse even, because it started out as a backup to an in house training course” – but I and others thought on first look that it seems useful. John (I hope he doesn’t mind me saying) can be on the curmudgeon scale – sometimes quite extremely so – but he certainly has useful experience, techniques, and perspective to share.

The book:
key concepts in systems thinking – John Evans

He also shared this:
https://www.academia.edu/48912553/Chapter_2_The_Biological_Basis_of_Thought_and_Perception