Systemantics/The Systems Bible, by John Gall, for a lighthearted, whimsical introduction through real-world examples across a range of industries. An Introducti

Systemantics/The Systems Bible, by John Gall, for a lighthearted, whimsical introduction through real-world examples across a range of industries. An Introduction to General Systems Thinking, by Gerald Weinberg, for a more rigorous/structured introduction. I've heard good things about Donella Meadows, but I haven't read anything of hers yet.