Use of Mobile Technology to Calm Upset Children: Associations With Social Emotional Development.
4. National Center for Education Statistics; US Department of Education. Average National Assessment of Educational Progress reading scale scores and percentage distribution of students, by age, amount of reading for school and for fun, and time spent on homework and watching TV/video: selected years, 1984 through 2008. http:/nces.ed.gov/programs/digest/d12/tables/dt12_144 .asp. Accessed September 13, 2015.
JAMA pediatrics