Books about a materialist understanding of transness

Hello, I have been thinking for some time about how traness should be defined, as should it be just some sort of identity that someone has, or is it something that is material

The first way to define being trans is just the way that the majority of the popular LGBT movement has chosen, so i wanted to ask all of you if you could give me some book recs that would define transness as something that is material, and not just a feeling