Chvira, D. A., Shipon-Blum, E., Hitchcock, C., Cohan, S., Stein, Murray, B. (2007). Selective mutism and social anxiety disorder: All in the family?. Journal of the American Academy of Child & Adolescent Psychiatry. 46(11), 1464–472. doi:10.1097/chi.0b013e318149366a