พรหมสงฆ์ ก. “Sustainable Weste Problems Management Of Koh Samui Manicipality, Suratthani”. Pathumthani University Academic Journal, vol. 11, no. 2, Dec. 2019, pp. 80-94, https://so05.tci-thaijo.org/index.php/ptujournal/article/view/216285.