This is the first decent treatment of masking in autism that I've found, made better by the fact that one of the authors is #ActuallyAutistic. It gives a good overview of the (fairly minimal) research so far and I learned a lot from it.

My biggest frustration is that it's not very actionable: it's hard to see how the information presented could be used to ease the burden of masking, and the explicit advice for autistic adults is a single paragraph in the whole book.