There are many sources of information on the net about Bujinkan.

If you are looking for book, I'd recommend those which are written by Soke Masaaki Hatsumi as a starting point. Contact me if you would like any advice on books to choose. Amazon have a good selection to start with. 

Other Texts...

The Book of Five Rings (五輪書 Go Rin No Sho) is a text on kenjutsu and the martial arts in general, written by the samurai warrior Miyamoto Musashi circa 1645. It is considered a classic treatise on military strategy, much like Sun Tzu's The Art of War and Chanakya's Arthashastra.

There have been various translations made over the years, and it enjoys an audience considerably broader than only that of martial artists: for instance, some business leaders find its discussion of conflict and taking the advantage to be relevant to their work. The modern-day Hyōhō Niten Ichi-ryū employs it as a manual of technique and philosophy. 

See the link in the documents below to download a copy.
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
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Flyer for classes  82k v. 2 15 Feb 2012, 05:15 kashim choudhury
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Go Rin No Sho  266k v. 2 15 Feb 2012, 05:16 kashim choudhury