Xingyi, The Boxing Manual

The Xingyi Boxing Manual, Hebei Style's Five Principles and Seven Words, edited by Jin Yunting, translated by John Groschwitz

This book was originally written in the 1920s, published in 1931, and published as a translation in English in 2004. Simple, straightforward text on the Five Elements is aptly, yet simply, augmented by Seven Words for Practice and Teacher biographies.