Rodgers, J., Riby, D., Janes, E., Connolly, B., & McConachie, H. (2012). Anxiety and Repetitive Behaviours in Autism Spectrum Disorders and Williams syndrome: A Cross-syndrome Comparison. Journal of Autism and Developmental Disorders, 42(2), 175-180. https://doi.org/10.1007/s10803-011-1225-x