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Dyfyniad Arddull ChicagoLabovitz,Sanford. Introduction to Social Research. 2. New York: Mc Graw Hill Book Company, 1976.
Dyfyniad MLALabovitz,Sanford. Introduction to Social Research. 2. Mc Graw Hill Book Company, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.