สุทธิ์ประเสริฐ สุภาพร. 2019. “The Study of Procurement in the Past Decade of Maluan Subdistrict Administrative Organisation, Phunphin, Suratthani”. Thai Interdisciplinary and Sustainability Review 2 (1). Bangkok, Thailand:260-94. https://so03.tci-thaijo.org/index.php/JIRGS/article/view/225501.