Yuth Thongcharoen และผู้แต่งคนอื่นๆ. (2016) An investigation into the perceptions of Thai international tertiary students towards the outward ethnic looking appearance of their EFL teachers in Thailand. National Institute of Development Administration:ม.ป.ท.Yuth Thongcharoen และผู้แต่งคนอื่นๆ. 2016. An investigation into the perceptions of Thai international tertiary students towards the outward ethnic looking appearance of their EFL teachers in Thailand. ม.ป.ท.:National Institute of Development Administration;Yuth Thongcharoen และผู้แต่งคนอื่นๆ. An investigation into the perceptions of Thai international tertiary students towards the outward ethnic looking appearance of their EFL teachers in Thailand. ม.ป.ท.:National Institute of Development Administration, 2016. Print.