Nakornsri, Komsan. “Rate of Azolla (Azolla pinnata B.Br.) on Weed Control in Pre-Germinated Direct-Seeded Rice”. Thai Agricultural Research Journal 17, no. 3 (December 13, 1999): 303–309. accessed September 15, 2026. https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/229252.