Mongkol Kwangwaropas. “Effects of Using a Portable Rotary Rice Weeder on Yield in the North Eastern Regions’ Rice Transplanting Field”. Agriculture and Natural Resources 24, no. 4 (December 30, 1990): 479–486. accessed August 29, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/242240.