Chatpanyacharoen, W., N. Hungspreug, B. Anurugsa, and S. Taweesuk. “Water Footprint Evaluation of Oryza Sativa L.Tha Wang Pha District, Nan Province”. Science & Technology Asia, vol. 20, no. 4, Dec. 2015, pp. 21-28, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/44167.