Donsey, Manoch. “Comparative Study on the Use of Green Manure, Chemical Fertilizer, and Farmyard Manure to Increase Cassava Yield”. Thai Agricultural Research Journal 1, no. 2 (May 1, 1983): 94–99. accessed October 2, 2026. https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245728.