Ridpath, I., & Ian Ridpath. (2003). A. Oxford,New York: Oxford University Press.
Dyfyniad Arddull ChicagoRidpath, Ian, và Ian Ridpath. A. Oxford,New York: Oxford University Press, 2003.
Dyfyniad MLARidpath, Ian, và Ian Ridpath. A. Oxford,New York: Oxford University Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.