Kalawong, S., T. S. Songka, W. Sukeevong, and N. Sanggam. “Guidelines for Development of Tourism Professionals According to the ASEAN Mutual Recognition Arrangement on Tourism Professionals (MRA on TP)”. Journal of the Association of Researchers, vol. 22, no. 3, July 2020, pp. 108-20, https://so04.tci-thaijo.org/index.php/jar/article/view/244651.