- Soil Taxonomy, A Basic System of Soil Classification for Making and Interpreting Soil Survey
- Natural Resources Conservation Service, USDA
- Keys to Soil Taxonomy, USDA-National Soil Conservation Service
- Soil Survey Manual, Soil Conservation Service, U.S. Department of Agriculture Handbook 18
- Land-Capability Classification (Ag Handbook 210)
- Soil Survey Field and Laboratory Methods Manual (SSIR 51)
- Field Book for Describing and Sampling Soils, version 3.0
- Soil Resource Development Institute (SRDI), Bangladesh
- FAO Soils Portal, FAO
- Global Soil Partnership