[elviejo79]

The Fifth Discipline by Senge. Also a great introduction to systems thinking.

Also everything written by Goldratt.

In particular: The Goal and It's not luck Both are business novels, they read lightly but the lessons are profound.

[el_dev_hell]

The Goal is both insightful and hilarious.

The system-oriented lessons/examples are great. The 80s style dialogues, integrations, and throwbacks are fun sideshows.