Kongdej Tungaya. (1991) A study of energy demand in pumping irrigation for rice cultivation in Thailand a case study in the North and Central regions. Mahidol University,:ม.ป.ท.Kongdej Tungaya. 1991. A study of energy demand in pumping irrigation for rice cultivation in Thailand a case study in the North and Central regions. ม.ป.ท.:Mahidol University,;Kongdej Tungaya. A study of energy demand in pumping irrigation for rice cultivation in Thailand a case study in the North and Central regions. ม.ป.ท.:Mahidol University, 1991. Print.