Pornphen Lalitnuntikul และ Kassara Sukpatch. (2014) Integrated management model of day spas in Thailand. National Institute of Development Administration:ม.ป.ท.Pornphen Lalitnuntikul และ Kassara Sukpatch. 2014. Integrated management model of day spas in Thailand. ม.ป.ท.:National Institute of Development Administration;Pornphen Lalitnuntikul และ Kassara Sukpatch. Integrated management model of day spas in Thailand. ม.ป.ท.:National Institute of Development Administration, 2014. Print.