Surapote NaThalang และ Wisakha Phoochinda. (2019) The environmental management approach for small hotel in Koh Chang (Chang Island), Trat province. National Institute of Development Administration:ม.ป.ท.Surapote NaThalang และ Wisakha Phoochinda. 2019. The environmental management approach for small hotel in Koh Chang (Chang Island), Trat province. ม.ป.ท.:National Institute of Development Administration;Surapote NaThalang และ Wisakha Phoochinda. The environmental management approach for small hotel in Koh Chang (Chang Island), Trat province. ม.ป.ท.:National Institute of Development Administration, 2019. Print.