Ernst, W. G. (2000). Earth systems: Processes and issues. Cambridge University Press.
Dyfyniad Arddull ChicagoErnst, W. G. Earth Systems: Processes and Issues. Cambridge: Cambridge University Press, 2000.
Dyfyniad MLAErnst, W. G. Earth Systems: Processes and Issues. Cambridge University Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.