1. August, D., Carlo, M., Dressler, C., & Snow, C. (2005). The critical role of vocabulary development for English language learners. Learning Disabilities Research & Practice, 20(1), 50–57.
2. Barnett, W. S., & Yarosz, D. J. (2004). Who goes to preschool and why does it matter? Policy Matters, 8(15), 2–16.
3. Battenberg, J. K., & Merbler, J. B. (1989). Touch screen versus keyboard: a comparison of task performance of young children. Journal of Special Education Technology, 10(2), 24–28.
4. Beck, I. L., McKeown, M. G., & Kucan, L. (2008). Creating robust vocabulary: Frequently asked questions and extended examples. New York: The Guilford Press.
5. Best Apps for Kids. (2014). Best Apps for Kids. Retrieved from
http://www.bestappsforkids.org/
.