"Autism and Asperger Syndrome" ~ Edited by Uta Frith
I highly recommend it. It's a tough read, because it's directed specifically toward professionals, but from what I've seen Zelda, I doubt you'd have much trouble with it.
It was a real eye opener for me in that it not only helped my understanding of AS itself, but in my understanding of the historical development of the diagnosis itself. I had no idea how little if anything has ever been known of the causes. It's really just about categorization of certain sets of symptoms and nothing more. The real awareness I got out of that book is that because that's really what "Asperger Syndrome" is, it's not surprising so much debate there has been over it, down to and including whether it's a real "syndrome" or not.
That book, along with some others has convinced me that it is real, but helped in understanding quite a few viewpoints I don't necessarily agree with too.
Also, this is the first publication to contain an English translation of Asperger's papers, so it's like reading about the source itself, along with some of the earliest interpretations. It helped me a lot in gleaning how we got to the varied understandings that exist today.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...