Freeman-Mitford, Baron Algernon Bertram. "Tales of Old Japan." Indy Publishing and Amazon Kindle. Britain. 1910.
Review: First, this book is free on Amazon in the kindle edition. It does not get any better than that guaranteed.
Second, this book was first published in 1910 and written with the intent to provide greater insight into the culture and belief of the Japanese during a period of time that has deeply influenced how Japan is in modern times.
Third, anyone be they martial artist or just interested in learning about Japan will benefit from this book. As an example there is one small quote that adds to the explanation in the practice of sitting in a Zen posture under a waterfall during the coldest times of the year in Japan. In a nutshell it is about cleansing the soul as that is perceived by Japanese.
An excellent edition to anyone's library and the expense is "nothing." :-)