Brown, J. R. (1998). Recommended chemical soil test procedures: For the North Central Region (Rev. ed.). Missouri Agricultural Experiment Station.
Chicago-Zitierstil (17. Ausg.)Brown, J. R. Recommended Chemical Soil Test Procedures: For the North Central Region. Rev. ed. Columbia, MO: Missouri Agricultural Experiment Station, 1998.
MLA-Zitierstil (9. Ausg.)Brown, J. R. Recommended Chemical Soil Test Procedures: For the North Central Region. Rev. ed. Missouri Agricultural Experiment Station, 1998.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.