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I can do you one better, unlike books blogs are free. Here's what I recommend, start with the essential reading list on the right side (you'll have to scroll down some): http://freethoughtblogs.com/nataliereed
Beyond biology textbooks (one of which I am currently reading), do you have any books/literature devoted to the whole of understanding transgenderism/gender flexibility? You seem to be knowledgeable about/well read on the topic.
