Master Vincent Chu is a well known and accomplished Yang Style Tai Chi master. He has written a number of texts and contributes regularly to various martial arts magazines along with teaching around the world. Within his latest publications, which is best for people already practicing Tai Chi, he discusses very detailed information about Tai Chi and then explores these deep concepts by comparing large frame, medium frame and small frame movements.
The text is called Tai Chi Chuan: A Comparative Study. It is recommended for anyone who wants to delve deeper into the art of Tai Chi. Any Yang style practitioner will find the text valuable, but those from other styles will find the discussions and comparisons interesting and applicable to their own practice as well.