Lambert, R. (1981). The twentieth century. Cambridge University Press.
Dyfyniad Arddull ChicagoLambert, Rosemary. The Twentieth Century. Cambridge: Cambridge University Press, 1981.
Dyfyniad MLALambert, Rosemary. The Twentieth Century. Cambridge University Press, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.