Cheewaworanontree, Yossawat, Kridtharit Thongsin, and Piya Rontlaong. “Study on the Optimal Factors for Briquetting Charcoal from Coconut Shells Using a Full Factorial Experimental Design”. Wichcha Journal Nakhon Si Thammarat Rajabhat University 45, no. 1 (February 5, 2026): 48–62. accessed September 3, 2026. https://li01.tci-thaijo.org/index.php/wichcha/article/view/265278.