Jaichuen, N., and กลันทปุระ อ. “The Upgrading of Tharongchang Subdistrict Administrative Organization, Phunphin, Surat Thani to Sub-district Municipality: A Study of the Opinion of People, Administrators and Staffs”. Thai Interdisciplinary and Sustainability Review, vol. 4, no. 1, Dec. 2019, pp. 116-25, https://so03.tci-thaijo.org/index.php/JIRGS/article/view/228470.