Blender Quick Tips: Use GIMP to make normal maps for Blender — Malcolm Donaldson
Crafting Digital Media: Audacity, Blender, Drupal, GIMP, Scribus, and other Open Source Tools (Expert's Voice in Open Source): James, Daniel: 9781430218876: Amazon.com: Books
Can Blender use a Gimp file as an image texture? - Materials and Textures - Blender Artists Community
Painting Piero's Feather Textures in GIMP: Duerer's Progress - CG Cookie | Learn Blender, Online Tutorials and Feedback