I highly recommend the book Research of Martial Arts by Shifu Jonathan Bluestein. Research of Martial Arts is a book about the true essence of martial arts. It includes neither instruction on deadly killing techniques, nor mystical tales of so called super-human masters. Rather, it is a vast compilation of seriously thought-out observations made on the subject by himself (Jonathan), as well as many other martial artists and scientists, with a slight touch of history and humour.
Sample chapters:
http://media.wix.com/ugd/0cde99_2049dcd1c02c4cf391346f203baf4fd5.pdf
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Here is a link to Jonathan’s website where you can purchase the book as well as an Amazon link.:
https://www.amazon.com/Research-Martial-Jonathan-Bluestein-Shifu/dp/1499122519