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Dyfyniad Arddull ChicagoSullivan, John L. Introduction to Police Science. New York: McGraw-Hill, 1966.
Dyfyniad MLASullivan, John L. Introduction to Police Science. McGraw-Hill, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.