International Soil Reference and Information Centre, Food and Agriculture Organization of the United Nations, & Unesco. (1988). FAO-Unesco soil map of the world: Revised legend. FAO.
Citazione stile Chigago Style (17a edizione)International Soil Reference and Information Centre, Food and Agriculture Organization of the United Nations, e Unesco. FAO-Unesco Soil Map of the World: Revised Legend. Rome: FAO, 1988.
Citatione MLA (9a ed.)International Soil Reference and Information Centre, et al. FAO-Unesco Soil Map of the World: Revised Legend. FAO, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.