books etc to help high functioning Autistic and AS boys deal with puberty

Anyone any ideas about books etc that can help boys with high functioning autism and Aspergers Syndrome with puberty. I have 11 year old twin boys, one with autism and one with AS and ADHD, one of which is frightened of puberty and the other ignores the subject completely. They do have a big brother who is 14 so they have seen some of the changes (he has Global Developmental Delay not an ASD) but I am a single mum and their dad hasnn't bothered to keep up with access so hasn't been see for years. Their dad did not have an ASD.