FAO. (1993). World soil resources reports N.73: An international framework for evaluating sustainable land management. Rome: FAO.
Dyfyniad Arddull ChicagoFAO. World Soil Resources Reports N.73: An International Framework for Evaluating Sustainable Land Management. Rome: FAO, 1993.
Dyfyniad MLAFAO. World Soil Resources Reports N.73: An International Framework for Evaluating Sustainable Land Management. Rome: FAO, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.