Dijkshoorn JA, van Engelen VWP and Huting JRM 2008. Soil and landform properties for LADA partner countries (Argentina, China, Cuba, Senegal and The Gambia, South Africa and Tunisia). ISRIC report 2008/06 and GLADA report 2008/03, ISRIC – World Soil Information and FAO, Wageningen.
http://www.isric.org/isric/Webdocs/Docs/ISRIC_Report_2008_06.pdf