Schaefer, R. T. (2004). Sociology: A brief introduction (5th ed.). Boston: McGraw-Hill.
Dyfyniad Arddull ChicagoSchaefer, Richard T. Sociology: A Brief Introduction. 5th ed. Boston: McGraw-Hill, 2004.
Dyfyniad MLASchaefer, Richard T. Sociology: A Brief Introduction. 5th ed. Boston: McGraw-Hill, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.