Pat Nolan wrote the chapter on retriever training for the recently revised Waterfowl Hunting from the NRA's Hunter Skill Series.

NRA Site to purchase

The NRA says about this book:
If you’re an aspiring waterfowl hunter, or even an experienced waterfowler looking for a good reference manual, the NRA Hunter Skills Series book Waterfowl Hunting has been revised and updated and covers waterfowl hunting from A to Z.

This award-winning manual has chapters on waterfowl biology, gear preparation, duck dogs, shotgunning, tactics and techniques for hunting waterfowl, decoy deployment, calling, game care and cooking, and much more. Most notably, the book has a section devoted to waterfowl identification, which offers full illustrations for the most common waterfowl in North America. This section has information on how to identify waterfowl by flock pattern, silhouette, notable features, size and sounds. Inside the book’s more than 270 pages are color photographs and detailed diagrams and illustrations to make you a more knowledgeable waterfowl hunter.