(1999). A dictionary of science (4th ed.). New York: Oxford University Press.
Dyfyniad Arddull ChicagoA Dictionary of Science. 4th ed. New York: Oxford University Press, 1999.
Dyfyniad MLAA Dictionary of Science. 4th ed. New York: Oxford University Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.