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