Chuapung , Benjaporn, Nattaphorn Dokboonnak Groom, and Thapakorn Thongkamnush. 2022. “Guidelines to Create Adding Values for the Homestays for the Elderly Tourists in Tha Kha Sub-District, Amphawa Districh, Samut Songkhram Province”. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University 17 (1):219-30. https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/254437.