Toynbee, A. (1948). A study of history. New York: Oxford University Press.
Dyfyniad Arddull ChicagoToynbee, Arnold. A Study of History. New York: Oxford University Press, 1948.
Dyfyniad MLAToynbee, Arnold. A Study of History. New York: Oxford University Press, 1948.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.