Jirapa Abhakorn. (2013) Investigating the Use of Student Portfolios to Develop and Assess Students’ Metacognition in EFL Learning. National Institute of Development Administration:ม.ป.ท.Jirapa Abhakorn. 2013. Investigating the Use of Student Portfolios to Develop and Assess Students’ Metacognition in EFL Learning. ม.ป.ท.:National Institute of Development Administration;Jirapa Abhakorn. Investigating the Use of Student Portfolios to Develop and Assess Students’ Metacognition in EFL Learning. ม.ป.ท.:National Institute of Development Administration, 2013. Print.