Cohen, J. / 1992 / A power primer / Psychological Bulletin 112 (1) : 155 ~ 159 Do, S. Lee. / 2004 / Emotions and classroom talk : Toward a model of the role of affect in students’ experiences of classroom discussions / Journal of Educational Psycholog Dodson, M. M. / 2000 / Monologic and dialogic conversations: How preservice teachers socially construct knowledge through oral and computer-mediated classroom discourse / Yearbook Goodwin, J. / 2003 / Students’ perspectives on debate exercises in content area classes / Communication Education 52 (2) : 157 ~ 163 Keller, J. M. / 1993 / Course interest survey / Instructional Systems Program, Florida State University