1. Christakis DA, FJ Zimmerman, DL DiGiuseppe, CA McCarty. 2004. Early Television Exposure and Subsequent Attentional Problems in Children. http://www.seattlechildrens.org/home/pdf/early_television_and_attentional_problems.pdf.
2. DeGaetano G. Visual media and Young Children's Attention Spans. http://users.stargate.net/~cokids/VisualMedia.html
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