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Nguyen และผู้แต่งคนอื่นๆ. Agricultural sustainability of a composite swiddening system : a case study in the uplands of northern Vietnam. . Khon Kaen:Khon Kaen University, 2004.
Nguyen และผู้แต่งคนอื่นๆ. (2004) Agricultural sustainability of a composite swiddening system : a case study in the uplands of northern Vietnam . Khon Kaen University/Khon Kaen.