Robson, W. (1995). The twentieth-century world. Oxford University Press.
Dyfyniad Arddull ChicagoRobson, Walter. The Twentieth-century World. Oxford: Oxford University Press, 1995.
Dyfyniad MLARobson, Walter. The Twentieth-century World. Oxford University Press, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.