The WRB Working Group has a strong relationship to the Food and Agriculture Organization of the United Nations (FAO), where the WRB documents are published.
The third edition, update 2015, is the currently valid WRB. At present, it is available in four languages:
Polish - Please contact Przemyslaw Charzynski: pecha[at]umk.pl
The correct citation of the English version is:
IUSS Working Group WRB. 2015. World Reference Base for Soil Resources 2014, update 2015. International soil classification system for naming soils and creating legends for soil maps. World Soil Resources Reports No. 106. FAO, Rome.
It has been compiled under the leadership of Peter Schad (Germany), Cornie van Huyssteen (South Africa) and Erika Michéli (Hungary). The fundamental decisions have been made by the members of the WRB Board:
Lúcia Anjos (Brazil), Carlos Cruz Gaistardo (Mexico), Seppe Deckers (Belgium), Stefaan Dondeyne (Belgium), Einar Eberhardt (Germany), Maria Gerasimova (Russia), Ben Harms (Australia), Arwyn Jones (European Commission), Pavel Krasilnikov (Russia), Thomas Reinsch (United States of America), Ronald Vargas (FAO), and Ganlin Zhang (China).
The definitions in the WRB are based on field and laboratory data. The field data are according to the FAO Guidelines for Soil Description (FAO 2006) and the laboratory data according to the Procedures for Soil Analysis (Van Reeuwijk 2002). The latter are published by the International Soil Reference and Information Centre (ISRIC).