Take a photo of a barcode or cover
stag1e 's review for:
Thinking in Systems: A Primer
by Donella H. Meadows
Albeit a bit simplistic but it gets the point across very well. I have already thought about some things that were explained in this but other parts have helped me crystallize my ideas. It will definitely be (another) a useful tool in the shed on how to view the world. Surely recommended to everyone!