Dragonhour
White Belt
I have found some books and articles to be timeless (that I can go back to them numerous times and decades later to extract new lessons and perspectives) and spanning across the martial art (easily applicable in strategy and tactics throughout different disciplines). These are my top two even though I studied Tae Kwon Do and Jeet Kune Do, and I thought a discussion of everyone's top two with links when available would be useful to all.
Heiho Kadensho by Munenori Yagyu
Go Rin No Sho (Book of Five Rings) by Miyamoto Musashi
Heiho Kadensho by Munenori Yagyu
Go Rin No Sho (Book of Five Rings) by Miyamoto Musashi