I recommend looking into anything around processes or process-building/management, project management, how incentives work, and how the brain works. The natural world and the corporate world are great examples of systems in action.
Checklist Manifesto is a great (and short/easy) read that I also recommend, but I don't think it's going to be especially helpful to someone looking for techniques to develop new systems thinking models.
At most, it's a recounting of someone else's very specific systems work that has some unexpectedly strong outcomes from surprisingly simple drivers.
Building Evolutionary Architecture
The Checklist Manifesto
The Half Life of Data
How Buildings Learn
I recommend looking into anything around processes or process-building/management, project management, how incentives work, and how the brain works. The natural world and the corporate world are great examples of systems in action.