Here you can find useful links to websites and download articles, books, etc.

http://www.thejointlibrary.org/autism/
http://www.autism-resources.com
http://www.autismuk.com/
http://autism.about.com/
http://iautistic.com/free-autism-books.php
http://download-book.net/ebook-autism-pdf.html 
http://www.theautismnews.com/
http://books-free.org/e-book/Autism-Play-and-Social-Interaction-rapidshare-download/
http://www.sciencedirect.com/science/book/9780123736062
http://www.tradebit.com/filedetail.php/832725-the-essential-guide-to-autism-ebook
http://books-free.org/e-book/Understanding-Autism-For-Dummies-rapidshare-download/ 
http://www.pdfgeni.com/book/pecs-autisme-pdf.html
http://www.autism.org.uk/shop/books-and-resources-from-the-nas/autism%20awareness.aspx
http://www.autismcoloringbook.com/
http://www.autism.net/
http://www.tucsonautism.org/library.html
http://www.autism.com/
http://www.espa-research.org.uk/