Siwalak Pathaveerat, Bundit jarimopas, Anek Sukcharoen, Jirawat Danthonglang, and Chanchai karnchanasirisombat. “Design and Test of Fruit Power Ladder”. Agriculture and Natural Resources 27, no. 5 (December 31, 1993): 79–86. accessed April 10, 2025. https://li01.tci-thaijo.org/index.php/anres/article/view/241744.