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Sources for scientific journals are provided below. New videos come out every Thursday so subscribe for more videos.
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Sources
Number 1
http://www.ncbi.nlm.nih.gov/pubmed/17958704
http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=1988-33924-001
http://www.ncbi.nlm.nih.gov/pubmed/17259579

Number 2
http://www.ncbi.nlm.nih.gov/pubmed/16163517
http://psycnet.apa.org/index.cfm?fa=search.displayRecord&UID=2008-00342-002

Number 3
http://www.ncbi.nlm.nih.gov/pubmed/15250790
http://www.ncbi.nlm.nih.gov/pubmed/19386767

Number 4
http://link.springer.com/article/10.1007%2FBF01173206