(1968). Britain: An official handbook. London: British. Central Office of Information.
Dyfyniad Arddull ChicagoBritain: An Official Handbook. London: British. Central Office of Information, 1968.
Dyfyniad MLABritain: An Official Handbook. London: British. Central Office of Information, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.