Hawrylyshyn, B. (1980). Road maps to the future. Oxford: Pergamon Press.
Dyfyniad Arddull ChicagoHawrylyshyn, Bohdan. Road Maps to the Future. Oxford: Pergamon Press, 1980.
Dyfyniad MLAHawrylyshyn, Bohdan. Road Maps to the Future. Oxford: Pergamon Press, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.