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Dyfyniad Arddull ChicagoCaplovitz, David. The Stages of Social Research. New York: Wiley, 1983.
Dyfyniad MLACaplovitz, David. The Stages of Social Research. Wiley, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.