1. American Speech Language Hearing Association. (2010). How does your child hear and talk: Birth to one year. Retrieved from: http://www.asha.org/public/speech/development/01.htm
2. Berko-Gleason, J., & Burstein Ratner, N. (2008). The development of language (7th ed.). Upper Saddle River: Prentice Hall.
3. Boysson-Bardies, B. (1999). How language comes to children: From birth to two years. Cambridge, MA: MIT Press.
4. Davis, B., & MacNeilage, P. F. (1995). The articulatory basis of babbling. Journal of Speech and Hearing Research, 38, 1199–1211.
5. Dawson, G., & Werner, E. (2005). Validation of the phenomenon of autistic regression using home videotapes. Archives of General Psychiatry, 62, 889–895.