Brown, J. R. (1998). Recommended chemical soil test procedures: For the North Central Region (Rev. ed.). Missouri Agricultural Experiment Station.
Citace podle Chicago (17th ed.)Brown, J. R. Recommended Chemical Soil Test Procedures: For the North Central Region. Rev. ed. Columbia, MO: Missouri Agricultural Experiment Station, 1998.
Citace podle MLA (9th ed.)Brown, J. R. Recommended Chemical Soil Test Procedures: For the North Central Region. Rev. ed. Missouri Agricultural Experiment Station, 1998.
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