Thongruang, S., S. Manatrinon, T. Swangkit, and S. Kochasopon. “Yields, Forage Characteristics, and Nutritive Values of Purple Guinea Grass and Mombasa Guinea Grass at Different Cutting Ages”. Journal of Mahanakorn Veterinary Medicine, vol. 15, no. 2, Jan. 2021, pp. 199-07, https://li01.tci-thaijo.org/index.php/jmvm/article/view/244893.