Koedphon, Jaruwan. “Factors Affecting the Enhancement and Service Quality Development of Premium Thai Massage Establishments in Uttaradit Province”. Princess of Naradhiwas University Journal 18, no. 3 (September 30, 2026): 174–191. accessed October 6, 2026. https://li01.tci-thaijo.org/index.php/pnujr/article/view/269531.