Chaiwut Sengnui. (1993) Economic evaluation of electrical pumping irrigation project : a case study of Nakhon Si Thammarat province. Mahidol University,:ม.ป.ท.Chaiwut Sengnui. 1993. Economic evaluation of electrical pumping irrigation project : a case study of Nakhon Si Thammarat province. ม.ป.ท.:Mahidol University,;Chaiwut Sengnui. Economic evaluation of electrical pumping irrigation project : a case study of Nakhon Si Thammarat province. ม.ป.ท.:Mahidol University, 1993. Print.