FAO. (1996). FAO soils bulletin N.73: Agro-ecological zoning: Guidelines. Rome: FAO.
Trích dẫn kiểu ChicagoFAO. FAO Soils Bulletin N.73: Agro-ecological Zoning: Guidelines. Rome: FAO, 1996.
MLA CitationFAO. FAO Soils Bulletin N.73: Agro-ecological Zoning: Guidelines. Rome: FAO, 1996.
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