Wild, A. (1993). Soil and the Environment an Introduction - Alan Wild. Cambridge University Press.
Dyfyniad Arddull ChicagoWild, Alan. Soil and the Environment an Introduction - Alan Wild. Cambridge University Press, 1993.
Dyfyniad MLAWild, Alan. Soil and the Environment an Introduction - Alan Wild. Cambridge University Press, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.