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Dyfyniad Arddull ChicagoRemler, Dahlia K., and Gregg G Van Ryzin. Research Methods in Practice: Strategies for Description and Causation. Los Angeles: Sage, 2011.
Dyfyniad MLARemler, Dahlia K., and Gregg G Van Ryzin. Research Methods in Practice: Strategies for Description and Causation. Sage, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.