Nayana Puengpan, Terdsak Subhasaram, Pongsiri Patcharapreecha, and Hidenori Wada. 1991. “Formation and Expansion of Salt Patches in the Paddy Field I. A Salinization Process Observed in the Field”. Agriculture and Natural Resources 25 (4). Bangkok, Thailand:469-76. https://li01.tci-thaijo.org/index.php/anres/article/view/242001.