Panitpim Sittisak และ Benchaphun Ekasingh. (2014) Optimal resource management with the multiple goals of citrus-based farming systems at farm and watershed levels, Chiang Mai province. Chiang Mai University:ม.ป.ท.Panitpim Sittisak และ Benchaphun Ekasingh. 2014. Optimal resource management with the multiple goals of citrus-based farming systems at farm and watershed levels, Chiang Mai province. ม.ป.ท.:Chiang Mai University;Panitpim Sittisak และ Benchaphun Ekasingh. Optimal resource management with the multiple goals of citrus-based farming systems at farm and watershed levels, Chiang Mai province. ม.ป.ท.:Chiang Mai University, 2014. Print.