Chuapung , B. ., N. . Dokboonnak Groom, and T. . Thongkamnush. “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, vol. 17, no. 1, May 2022, pp. 219-30, https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/254437.