Vernadsky, G. (1954). A history of Russia (4th ed., completely rev.). Yale University Press.
Dyfyniad Arddull ChicagoVernadsky, George. A History of Russia. 4th ed., completely rev. New Haven: Yale University Press, 1954.
Dyfyniad MLAVernadsky, George. A History of Russia. 4th ed., completely rev. Yale University Press, 1954.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.