The Complete Guide to Asperger's Syndrome, by Tony Attwood, was the 'gold' standard reference for AS at the time it was published.
What exactly is the status of the book in a post DSM-5 world?
Is the book now obsolescent if AS no longer officially exists and is no longer given as a diagnosis?
Is the book no longer recommended reading by the medical profession for parents, teachers, educational psychologists, or even the medical profession themselves?
If the book is now obsolescent, then exactly which book has replaced it?