Taweephol, R. “Safety Standard in Tourist Attraction That Affects to the Trust of Foreign Tourist in Yaowarat Business Area”. Research and Development Journal, Loei Rajabhat University, vol. 17, no. 62, Dec. 2022, pp. 52-60, https://so05.tci-thaijo.org/index.php/researchjournal-lru/article/view/255736.