Jaichuen, N., & กลันทปุระ อ. (2019). 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, 4(1), 116–125. retrieved from https://so03.tci-thaijo.org/index.php/JIRGS/article/view/228470