The following books by Xu Zhen can also be considered:
1937 published Textual Research Record of Taiji Biography, Theory of Taiji Biography and Differentiation of Taiji Biography, which were all the rage.
(The latter two books are now "The Theory of Taiji Biography and Dong Dialectical Pseudo-Co-edited")
Xu Zhen, whose real name is Dong Zhe (1898- 1967), was a famous historian and university professor in early Tai Ji Chuan. He studied under Hou's tea boxing and Xingyiquan, and under Tai Ji Chuan's Hao. During the Cultural Revolution, he suffered a blow and a stroke.
At present, there are traditional vertical photocopies and simplified horizontal contrast editions for sale in bookstores, which is quite convenient for people with poor foundation in ancient Chinese.
Tai Ji Chuan Practical Boxing Law written by Mr. Hong was published in 1989.
The Complete Works of Tai Ji Chuan edited by Feng Zhiqiang, Li Bingci and Sun Jianyun was published in 2002.