Ruamsup, Panwasa. “Guidelines for development of marketing mix of natural attractions in Kanchanaburi Province”. Journal of Management Science Nakhon Pathom Rajabhat University 6, no. 1 (June 24, 2019): 75–90. accessed April 10, 2025. https://so03.tci-thaijo.org/index.php/JMSNPRU/article/view/197231.