Great Britain. Office of Population Censuses and Surveys. (1984). Census 1981.
Dyfyniad Arddull ChicagoGreat Britain. Office of Population Censuses and Surveys. Census 1981. London, 1984.
Dyfyniad MLAGreat Britain. Office of Population Censuses and Surveys. Census 1981. 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.