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)