1. Adams, C., Cooke, R., Crutchley, A., Hesketh, A., Reeves, D., & American Psychiatric Association. (2001). Assessment of comprehension and expression 6–11 (ACE 6–11). Windsor: NFER Nelson.
2. American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders: DSM-5. Arlington, VA
3. Bates, E., Camaioni, L., & Volterra, V. (1975). The acquisition of performatives prior to speech. Merrill-Palmer quarterly of behavior and development, 21(3), 205–226.
4. Bishop, D. V. M. (2003). Children’s communication checklist – version 2 (CCC-2). London, UK: Psychological Corporation.
5. Bowers, L., Huisingh, R., & LoGiudice, C. (2008). Social learning developmental test: Elementry. East Moline: Linguisystems.