ดวงจันทร์ เกียรติศักดิ์. “Environmental ethical awareness of solid waste management”. Journal of Liberal Arts Prince of Songkla University 10, no. 2 (December 30, 2018): 438–479. accessed December 9, 2025. https://so03.tci-thaijo.org/index.php/journal-la/article/view/164119.