Here you will find the sample models that accompany the book.
You will need a copy of NetLogo to run the models. For many of the models, you will need the gradient extension, and for a few the NetLogo-R extension. All models are free for non-commercial use (license details here).
The models in each chapter of the book are linked below. Individual models are linked from the images.
You can also download all the models in a single model-zoo.zip file.