Here are the names of the two pressure cooker cookbooks that I use on a regular basis.
"The Best Pressure Cooker Cookbook Ever" by Pat Dailey. A small, easy to follow book that's good for everyday.
"The Ultimate Pressure Cooker Cookbook" by Tom Lacalamita. This is also an excellent, easy to follow book with more of a Mediterranean flair to the recipes.
Hope this info isn't too late!