URL: http://www.tandfonline.com/toc/hedp20/39/4#.U1BWd_ldXBw
URL: http://www.tandfonline.com/toc/hlns20/13/1#.U1BbAvldXBw
2004 Educational Psychologist, 39(4), URL: http://www.tandfonline.com/toc/hedp20/39/4#.U1BWd_ldXBw 2004 Journal of the Learning Sciences, 13(1)
URL: http://www.tandfonline.com/toc/hlns20/13/1#.U1BbAvldXBw
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