Complete Iron Palm Training for Self Defense: H. C. Chao (Complied and Edited by): Amazon.com: Books
kung fu - Iron palm monster hand training - Martial Arts Stack Exchange
Iron Palm conditioning (for beginners) - 6DRAGONSKUNGFU.COM
Toodokan Self Defence Academy - Traditional hand conditioning, makiwara and iron palm training isn't for everyone. But if you have an interest talk with Master John who has been using these training
How to turn your hand into Real iron Palm part 2 - Master Wong - YouTube