Dierolf, T. (2001). Soil Fertility Kit: A toolkit for acid, Upland soil fertility management in Southeast Asia. Indonesia: Agency for Agricultural Human resources development.
Chicago-tyylinen lähdeviittausDierolf, Thomas. Soil Fertility Kit: A Toolkit for Acid, Upland Soil Fertility Management in Southeast Asia. Indonesia: Agency for Agricultural Human resources development, 2001.
MLA-viiteDierolf, Thomas. Soil Fertility Kit: A Toolkit for Acid, Upland Soil Fertility Management in Southeast Asia. Indonesia: Agency for Agricultural Human resources development, 2001.
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