1. Ambitious about Autism 2014 http://www.ambitiousaboutautism.org.uk/page/about_autism/stats_and_facts/index.cfm
2. Measuring the reading abilities of nonverbal and verbal children with ASD using traditional paper-based and new digital test formats;Arnold;Journal of Autism and Developmental Disorders.
3. A prospective study of the relationship between specific language impairment, phonological disorders and reading retardation;Bishop;Journal of Child Psychology and Psychiatry and Allied Disciplines,1990
4. Deweerdt , S. 2013 Spectrum https://spectrumnews.org/news/study-of-nonverbal-autism-must-go-beyond-words-experts-say
5. DfE (Department for Education) 2013 https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/207670/Main_text-_SFR21_2013.pdf