IUSS Working Group WRB: World Reference Base for Soil Resources, 4th edition. International soil classification system for naming soils and creating legends for soil maps. International Union of Soil Sciences, Vienna, 2022, ISBN 979-8-9862451-1-9 ()
Soil Survey Staff, 1999. Soil taxonomy: a basic system of soil classification for making and interpreting soil surveys (2nd ed.). US Department of Agriculture Soil Conservation Service, Washington DC. Digitale versie: USDA Soil Taxonomy