Some highly informative sites we have come across deal with bullying of people with disabilities, including how people with autism are particularly prone to being bullied, and why. One of those that caught our attention focuses specifically on young adults: http://autismmythbusters.com/autistics/teenagers-and-early-adults/bullying/
Many organisations that deal with autism both in the UK and elsewhere have produced some really useful information on the subject. In addition, there are a number of scholarly articles about bullying and autism that you can find using a search engine.
You can also find out more practical information, help and guidance via the National Autism Association‘s resources about bullying: http://www.autismsafety.org/bullying.php.
There’s a useful section about practical things that parents can do if their autistic child is being bullied. Look for this button:
For further information about autism see the websites of the following organisations.
Some also have Facebook pages.
Mencap (UK wide)
Bryan’s Advocacy (Facebook)
Autism Mummies Belfast (Facebook, also part of a UK network)
Autism Plus (Yorkshire and Humber)
Finally the most comprehensive site I have found so far, and their are many across the globe, is this one based in North America. It is packed with information and resources and provides very valuable help and guidance.