Aroonluk, S., Prasertkul, T., Tongchure, S., Phitchayapon, C., and Talubnak, C. 2020. “The utilization of leguminous Gliricidia sepium as natural fertilizers to improve soil fertility”. International Journal of Agricultural Technology 16 (3):545-52. https://li04.tci-thaijo.org/index.php/IJAT/article/view/6992.