Sriprasert, P., P. Penmas, S. Pantaruk, and T. Rattnapong. “ Nakhon Si Thammarat”. Trends of Humanities and Social Sciences Research, vol. 8, no. 1, June 2020, pp. 259-77, https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/219054.