Hoang และผู้แต่งคนอื่นๆ. 1993. Evaluation of cropping system on sloping land in the Northern mountainous region of Viet Nam. Graduate School, Chiang Mai University;
Hoang และผู้แต่งคนอื่นๆ. (1993) Evaluation of cropping system on sloping land in the Northern mountainous region of Viet Nam . Chiang Mai University/Chiang Mai.
Hoang และผู้แต่งคนอื่นๆ. Evaluation of cropping system on sloping land in the Northern mountainous region of Viet Nam. . Chiang Mai:Chiang Mai University, 1993.
Hoang และผู้แต่งคนอื่นๆ. (1993) Evaluation of cropping system on sloping land in the Northern mountainous region of Viet Nam . Chiang Mai University/Chiang Mai.