Ebook: 形意大连环 Xingyi Dalianhuan

A scan of a book describing the Xingyi Dalianhuan form, movement by movement, in Chinese with photographs, by gongfu luminary Sha Guozheng. Poor quality, but mostly legible.

Several renditions of the form are available on youtube, this one by Sha Junjie (沙俊杰), Sha Guozheng's son, should probably be considered definitive:

https://www.youtube.com/watch?v=1N_wIu1g5H4