Cita APA (7th ed.)

(2006). World reference base for soil resources 2006: A framework for international classification, correaltion and communication. Food and Agriculture Organization of the United Nations.

Cita Chicago (17th ed.)

World Reference Base for Soil Resources 2006: A Framework for International Classification, Correaltion and Communication. Roma: Food and Agriculture Organization of the United Nations, 2006.

Cita MLA (9th ed.)

World Reference Base for Soil Resources 2006: A Framework for International Classification, Correaltion and Communication. Food and Agriculture Organization of the United Nations, 2006.