Anan Chieochankitkan และ Kassara Sukpatch. (2013) Developing service quality for spa establishments in the active beach tourism cluster, Thailand. National Institute of Development Administration:ม.ป.ท.Anan Chieochankitkan และ Kassara Sukpatch. 2013. Developing service quality for spa establishments in the active beach tourism cluster, Thailand. ม.ป.ท.:National Institute of Development Administration;Anan Chieochankitkan และ Kassara Sukpatch. Developing service quality for spa establishments in the active beach tourism cluster, Thailand. ม.ป.ท.:National Institute of Development Administration, 2013. Print.