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T. M.Andrews, M. J.Leonard, C. A.Colgrove, and S. T.Kalinowski. 2011. “Active Learning Not Associated with Student Learning in a Random Sample of College Biology Courses.” CBE—Life Sciences Education10 (4): 394–405. Available at http://www.lifescied.org/content/10/4/394.full.pdf+html (accessed August 21, 2014).