Sunanta Juntakool, Sanan Chantkam, Sayan Tudsri, and Pranee Khantongchai. “Effect of harvesting time on seed yield and quality of Guinea grass (Panicum maximum Jacq.)”. Agriculture and Natural Resources, vol. 23, no. 1, Mar. 1989, pp. 38-44, https://li01.tci-thaijo.org/index.php/anres/article/view/242278.