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Dyfyniad Arddull ChicagoThe Quantitative Analysis of Social Problems. Reading, Massachusetts: Addison-Wesley Publishing Company, 1970.
Dyfyniad MLAThe Quantitative Analysis of Social Problems. Addison-Wesley Publishing Company, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.