BIRO, P. S. (1983). Statistik Kriminal, Sumber Data Kepolisian Crime Statistics Data Sources From Police Force 1980-1981. BPS.
Dyfyniad Arddull ChicagoBIRO, PUSAT STATISTIK. Statistik Kriminal, Sumber Data Kepolisian Crime Statistics Data Sources From Police Force 1980-1981. BPS, 1983.
Dyfyniad MLABIRO, PUSAT STATISTIK. Statistik Kriminal, Sumber Data Kepolisian Crime Statistics Data Sources From Police Force 1980-1981. BPS, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.