สุทธิ์ประเสริฐ ส. “The Study of Procurement in the Past Decade of Maluan Subdistrict Administrative Organisation, Phunphin, Suratthani”. Thai Interdisciplinary and Sustainability Review, vol. 2, no. 1, Nov. 2019, pp. 260-94, https://so03.tci-thaijo.org/index.php/JIRGS/article/view/225501.