Jaichuen, N. and 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 (Dec. 2019), 116–125.