Daosook Boonyasarn และ Rugphong Vongsaroj. (2020) A small and medium-sized hotel business service innovation model for the mature travelers. National Institute of Development Administration:ม.ป.ท.Daosook Boonyasarn และ Rugphong Vongsaroj. 2020. A small and medium-sized hotel business service innovation model for the mature travelers. ม.ป.ท.:National Institute of Development Administration;Daosook Boonyasarn และ Rugphong Vongsaroj. A small and medium-sized hotel business service innovation model for the mature travelers. ม.ป.ท.:National Institute of Development Administration, 2020. Print.