Não informado. Tropical Soils Research Program, Annual Report. North Carolina State University, Soil Science Department.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Tropical Soils Research Program, Annual Report. Raleigh, NC: North Carolina State University, Soil Science Department.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Tropical Soils Research Program, Annual Report. North Carolina State University, Soil Science Department.
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