I'm sure there has been multiple threads in the past that have covered this topic however I feel it is important to constantly seek out new information and revisit certain texts as time goes by.
A few to start the list off:
Art of War - Sun Tzu
Principles of Personal Defense - Col. Jeff Cooper
Handgun Combatives - Dave Spaulding
The Farnam Method of Defensive Handgunning - John Farnam
No Second Place Winner - Bill Jordan
On Killing/Combat - LTC Dave Grossman
Warfighting - Department of the Navy (USMC Philosophy and Doctrine)
Any text, article, video or other sources of information on these topics would be welcome and greatly appreciated.
Thanks,
C.W. Clark