Tangmankongworakoon, Naruephat. “An Approach to Produce Biochar from Coffee Residue for Fuel and Soil Amendment Purpose”. International Journal of Recycling of Organic Waste in Agriculture 8, no. 4 (April 30, 2019). Accessed May 14, 2026. https://oiccpress.com/ijrowa/article/view/3340.