Thanapol Inprasertkul และ Rugphong Vongsaruj. (2020) Developing destination safety indicators and strategy for promoting tourists' safety confidence. National Institute of Development Administration:ม.ป.ท.Thanapol Inprasertkul และ Rugphong Vongsaruj. 2020. Developing destination safety indicators and strategy for promoting tourists' safety confidence. ม.ป.ท.:National Institute of Development Administration;Thanapol Inprasertkul และ Rugphong Vongsaruj. Developing destination safety indicators and strategy for promoting tourists' safety confidence. ม.ป.ท.:National Institute of Development Administration, 2020. Print.