Titiworada Polyiem. (2020) A study perception of learning and teaching principles of Pre-Service Teachers. <i>Journal of Humanities and Social Sciences</i>, <i>39</i>(2), .44-60.Titiworada Polyiem. "A study perception of learning and teaching principles of Pre-Service Teachers". Journal of Humanities and Social Sciences 39 (2020):.44-60.Titiworada Polyiem. A study perception of learning and teaching principles of Pre-Service Teachers. mahasarakham university:ม.ป.ท. 2020.