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- AOAC International
- International Plant Nutrition Institute
- Soil Survey Laboratory Methods Manual, USDA Natural Resource Conservation Service
- Carter, M.R., and E.G. Gregorich (eds). 2008. Soil sampling and methods of analysis. 2nd ed. Canadian Society of Soil Science, CRC Press and Taylor & Francis Group. Oxford, UK
- Sparks, D.L. (ed). 1996.Methods of Soil Analysis: chemical methods. Part 3. Soil Sci. Soc. Am. Book Series No. 5. ASA-SSSA, Madison, WI.
- Westerman, R.L. (ed) 1990. Soil Testing and Plant Analysis. 3rd edition. ASA-SSSA, Madison, WI.