A few random books that come to mind:
The Strategies of Low-Light Engagements - Ken J. Good
Every article Ken J. Good ever wrote
Practical Shooting: Beyond Fundamentals - Brian Enos
Training at the Speed of Life, Vol. 1: The Definitive Textbook for Police and Military Reality Based Training - Kenneth R. Murray
Everything from Mike Pannone, Paul Howe, and Kyle Lamb
Every Jerry Kuhnhausen shop manual
Defense-oriented authors:
Ken J. Good, Ken Murray, Mike Pannone, Paul Howe, Kyle Lamb, Pat McNamara, Andy Stanford, Jim Cirillo, Louis Awerbuck, Massad Ayoob
Competition-related authors:
Brian Enos, Steve Anderson, Ben Stoeger, Mike Seeklander, Saul Kirsch, Ron Avery