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Tran และผู้แต่งคนอื่นๆ. 1998. Nitrogen fixation of soybean as affected by nitrogen fertilizer application at different growth stages in Central Vietnam. Graduate School, Chiang Mai University;
Tran และผู้แต่งคนอื่นๆ. (1998) Nitrogen fixation of soybean as affected by nitrogen fertilizer application at different growth stages in Central Vietnam . Chiang Mai University/Chiang Mai.
Tran และผู้แต่งคนอื่นๆ. Nitrogen fixation of soybean as affected by nitrogen fertilizer application at different growth stages in Central Vietnam. . Chiang Mai:Chiang Mai University, 1998.
Tran และผู้แต่งคนอื่นๆ. (1998) Nitrogen fixation of soybean as affected by nitrogen fertilizer application at different growth stages in Central Vietnam . Chiang Mai University/Chiang Mai.