Homraruen, W., and W. Phoochinda. “Utilization of Durian Shell and Mangosteen Shell as Fuel Briquette and Fertilizer: A Case Study of Kaeng Hang Maeo District, Chanthaburi Province”. Ph.D. in Social Sciences Journal, vol. 9, no. 2, Aug. 2019, pp. 452-66, https://so05.tci-thaijo.org/index.php/phdssj/article/view/115886.