Surin Ongsuwan. 1991. Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand. Faculty of Graduate Studies, Mahidol University;
Surin Ongsuwan. (1991) Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand . Mahidol University/Bangkok.
Surin Ongsuwan. Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand. . Bangkok:Mahidol University, 1991.
Surin Ongsuwan. (1991) Energy consumption in rice land preparation : a case study in central and northeastern regions of Thailand . Mahidol University/Bangkok.