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TitleAll sizes | 13 Tom Lewis, Developmental Psychology Today, 1971 (Diagrammatic outline of positive reinforcement...) | Flickr - Photo Sharing!
Sourcehttp://www.flickr.com/photos/ajourneyroundmyskull/5368913738/sizes/o/in/photostream/
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PostedApril 09, 2013
CuratorMichael Paul Young