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Dyfyniad Arddull ChicagoJackson, Sherri L. Research Methods and Statistics: A Critical Thinking Approach. Australia: Thomson/Wadsworth, 2003.
Dyfyniad MLAJackson, Sherri L. Research Methods and Statistics: A Critical Thinking Approach. Thomson/Wadsworth, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.