Can I ask what your goal is? Documentaries are one thing, but if you're looking for the actual old old old documents that discuss things, that's going way back. However if you want a source acually written in English, Chinese Martial Arts: From Antiquity to the Twenty-first Century by Peter Allan Lorge is decent.

Otherwise if you can clarify I can probably offer some other suggestions.

/r/wma is a great resource for the HEMA (Historic European Martial Arts) community. We have wrestling treatises from the early 1400s, in both German and Italian. Most of them are part of larger works on longsword or other weapon-based styles, but wrestling features as a central part of the European tradition.