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Dyfyniad Arddull ChicagoSmith, Randolph A. Challenging Your Preconceptions: Thinking Critically About Psychology. Cincinnati: Brooks / Cole, 1995.
Dyfyniad MLASmith, Randolph A. Challenging Your Preconceptions: Thinking Critically About Psychology. Brooks / Cole, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.