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Dyfyniad Arddull ChicagoSchaefer, Richard T., Richard Floyd, and Bonnie Haaland. Sociology: A Brief Introduction. 1st Canadian ed. Toronto: McGraw-Hill, 2005.
Dyfyniad MLASchaefer, Richard T., et al. Sociology: A Brief Introduction. 1st Canadian ed. McGraw-Hill, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.