You might try the National Association for Education of Young Children (NAEYC)
http://www.naeyc.org/
If you do a search under autism, there are several links to professional journals. They'll talk about studies, best practices for educators/caregivers.
You could also try the American Academy of Pediatrics
http://www.aap.org
If you dig a bit more, you will probably find other similar organizations in other countries. Different cultural perspectives are always a good thing.
Good luck.
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Hoppiness is lurv.