https://www.amazon.com/Kuji-1-Everyone/dp/1926659074/ref=sr_1_1?ie=UTF8&qid=1507156059&sr=8-1&keywords=kuji+in
https://www.amazon.com/Kuji-Qi-Gong-Trilogy-ebook/dp/B00KK6EEFG/ref=sr_1_2?ie=UTF8&qid=1507156059&sr=8-2&keywords=kuji+in
first two results on Amazon, I have both and think they're good.