Withep Watawuti และ Rugphong Vongsaroj. (2017) Airline's roles for for supporting sustainable tourism development: a case study of Thailand. National Institute of Development Administration:ม.ป.ท.Withep Watawuti และ Rugphong Vongsaroj. 2017. Airline's roles for for supporting sustainable tourism development: a case study of Thailand. ม.ป.ท.:National Institute of Development Administration;Withep Watawuti และ Rugphong Vongsaroj. Airline's roles for for supporting sustainable tourism development: a case study of Thailand. ม.ป.ท.:National Institute of Development Administration, 2017. Print.