This was a comment on the question, but should be an answer. You don't. If you can't afford it, you can check it out of the library. If you want Lisa Mantchev to be able to keep writing so you can read more of her stuff, you buy it so she gets paid for her work.
Thanks to Marvin, this link is no longer Up) A couple of other books he mentions in the interview: A Korean book called “Daedalus Sword Art” by Kim Jung-hwon is listed as “Daedalus” by the SGI-USA; and the invisible/spiritual warrior and spiritual warrior's self-defence guide (book) is listed as “The Invisible Warrior” by the SGI-USA. It's a bit difficult to figure out which the correct one is, though, so if you can tell me the difference, please let me know or pass this link on. The book is Korean, the book is written in the ancient language of the ancient people from the Korean peninsula (it's still in use in this country), the title may mean something like a spiritual warrior book that teaches people about fighting spirit, but I can't imagine what the actual book it based on is named.