IIRC, it has been used as a textbook for systems theory classes in some universities, but it's concise and written for a general audience.
- Introduction to Systems Thinking (https://www.amazon.com/Thinking-Systems-Donella-H-Meadows/dp...)
- Fifth Discipline Fieldbook (https://www.amazon.com/Fifth-Discipline-Fieldbook-Strategies...)
- Systems Thinking for Social Change (https://www.amazon.com/Systems-Thinking-Social-Change-Conseq...)
Articles on Leading Systems Change:
- Dawn of Systems Leadership (https://ssir.org/articles/entry/the_dawn_of_system_leadershi...)
- Acting and Thinking Systemically (https://thesystemsthinker.com/acting-and-thinking-systemical...)
- Transforming the Systems Movement (https://thesystemsthinker.com/transforming-the-systems-movem...)
Relevant Tools and Websites:
- Kumu (https://kumu.io) - Web-based tool for building interactive system maps.
- The Systems Thinker (https://thesystemsthinker.com/) - Complete library of all "The Systems Thinker" publications over the past 30 years
(Disclosure: I'm a cofounder of Kumu)
- Loopy (http://ncase.me/loopy/) - An playground for building interactive systems maps.
(Disclosure: I'm a Developer at Kumu)
1. [The Pragmatic Programmer](https://pragprog.com)
2. Martin Fowler's [Refactoring Book](https://martinfowler.com/books/refactoring.html)
3. Kent Beck's [Test Driven Development: By Example](https://www.amazon.com/Test-Driven-Development-Kent-Beck/dp/...)
4. [Thinking in Systems: A Primer](https://www.amazon.com/Thinking-Systems-Donella-H-Meadows/dp...)
5. [Zen Mind, Beginner's Mind: Informal Talks on Zen Meditation and Practice](https://www.amazon.com/Zen-Mind-Beginners-Informal-Meditatio...)
6. [Pragmatic Thinking and Learning: Refactor Your Wetware](https://www.amazon.com/Pragmatic-Thinking-Learning-Refactor....)
Everything else was just looking at elements. Technology is important, for example, but exists within a system. They looked at the system. They had to simplify and assume a lot, which the media didn't understand (probably benign ignorance) and critics blew out of proportion (probably maliciously), but I found their approach the most meaningful.
Sadly, I know many people who care about the environment but don't understand the (relatively simple) math in their approach, and many people who understand the math but don't care about the environment, but almost no one who cares and understands. So in about a decade since reading it, I haven't found anyone I can talk to about it meaningfully.
A great companion by one of the authors is Thinking in Systems by Donella Meadows -- https://www.amazon.com/Thinking-Systems-Donella-H-Meadows/dp....
Both changed my views more than almost any other books.
Basically, a while back, some people realized that all systems (which comprises just about everything, basically) share similar modelable attributes.
If you're interested in this stuff Donella Meadow's book "Thinking in Systems" is a great introduction: http://www.amazon.com/Thinking-Systems-Donella-H-Meadows/dp/...