It may seem glib, but the best resource to spur one to think systemically is a three year-old child. Their favorite word seems to be "why?" and they will keep

It may seem glib, but the best resource to spur one to think systemically is a three year-old child. Their favorite word seems to be "why?" and they will keep asking it until you either reach an abstraction they accept, you get tired and concede you don't know by saying "because I said so," or they get tired and find something else. The third option is rare in my experience.