(2006). World reference base for soil resources 2006: A framework for international classification, correlation and communication. Food and agriculture organization of the United Nations.
Chicago-referens (17:e uppl.)World Reference Base for Soil Resources 2006: A Framework for International Classification, Correlation and Communication. Rome: Food and agriculture organization of the United Nations, 2006.
MLA-referens (9:e uppl.)World Reference Base for Soil Resources 2006: A Framework for International Classification, Correlation and Communication. Food and agriculture organization of the United Nations, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.