These three books are written by Frank Allen and Tina Zhang and published by North Atlantic Books/Blue Snake books and distributed through Random House. You also can purchase these books in the bookstores near you, Internet on-line stores, or go to www.amazon.com. These DVDs are produced by Wu Tang PCA, and the only purpose is making easy access for people who are interested in learning and reviewing these subjects that we are practicing and teaching. All DVDs can be played at all zones with DVD players and computers. Credit card payment is accepted. Paypal check out is safe. More DVDs of Internal Martial Arts of TaiJiQuan, XingYiQuan and related products are available at www.qigongforwomen.com