Arroyo และผู้แต่งคนอื่นๆ. (2020) A model proposal for tourism and hospitality undergraduate institutions in Thailand to obtain the UNWTO TEDQUAL certification. National Institute of Development Administration:ม.ป.ท.Arroyo และผู้แต่งคนอื่นๆ. 2020. A model proposal for tourism and hospitality undergraduate institutions in Thailand to obtain the UNWTO TEDQUAL certification. ม.ป.ท.:National Institute of Development Administration;Arroyo และผู้แต่งคนอื่นๆ. A model proposal for tourism and hospitality undergraduate institutions in Thailand to obtain the UNWTO TEDQUAL certification. ม.ป.ท.:National Institute of Development Administration, 2020. Print.