link: https://www.goodreads.com/book/show/3828902-thinking-in-systems author: Donella H. Meadows https://www.youtube.com/watch?v=XBFpasY2Gd8 youtube https://www.youtube.com/watch?v=C6jhqpe6Xoc youtube https://www.youtube.com/watch?v=fqMvg0QjY9A