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Ryan, T. (2012, August). Intro into the Thinkers Keys. In https://www.youtube.com/watch?v=UWHw-4pnoMQ. Retrieved July 22, 2014
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Ryan, T. (2012, August). Intro into the Thinkers Keys. In https://www.youtube.com/watch?v=UWHw-4pnoMQ. Retrieved July 22, 2014
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