Chaiyapong Thepprasit, and Viraphol Taesombat. 2003. “Areal Rainfall Reduction Factor and Areal Flood Peak Reduction Factor for Upper Chao Phraya River Basin”. Agriculture and Natural Resources 37 (2). Bangkok, Thailand:224-33. https://li01.tci-thaijo.org/index.php/anres/article/view/242865.