Julie Golob is not only an amazing shooter and promoter, but she's a great teacher. This book is the perfect primer for those interested in trying out competition shooting. It talks about various sports available, the equipment you use, etc.
skills & drills
Ben Stoeger is a many-time world champion shooter, and this book is an outstanding compilation of training drills that will allow any competition shooter to build and refine the skills needed for for action pistol shooting sports. His focus is USPSA, but these skills translate well to IDPA, 3-gun, etc.
the law of self defense
Unlike me, Branca is a lawyer, and is well versed in the law related to self defense. This book is a tremendous resource to help gun owners understand their rights and responsibilities related to defensive gun use.