The following books may be of interest to you. I cannot of course guarantee that you will find them useful, they are simply ones that I like.
Martial Musings - Thoughts on Tai Chi... by Robert Agar-Hutton *** A free eBook for you - download the .pdf version.
Click on the title (in green) to be taken to Amazon's site for details of the item.
Simplified Tai Chi Chuan: 24 Postures with Applications & Standard 48 Postures by Liang Shou-Yu and Wu Wen Ching
Tai Chi for Health by Chen Zheng Lei
Tai Chi by Erle Montaigue
Simply Tai Chi [With DVD] by Graham Bryant and Lorraine James *** Very useful as this is the form that our 8 Move Energy form comes from - however the book and DVD is out of print and difficult to source.
108 Insights into Tai Chi Chuan: A String of Pearls by Michael Gilman
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