WORLD REFERENCE BASE FOR SOIL RESOURCES (WRBSR): WRBSR, 2014 WRBSR, 2006 WRBSR, 1998 (1ª versão) SOIL TAXONOMY Soil Taxonomy, 1999 Keys to Soil Taxonomy (12ª ed., 2014) Illustrated Guide to Soil Taxonomy ( version 1.0, 2014)
