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Dyfyniad Arddull ChicagoDoby, John Thomas, Alvin Boskoff, and William W. Pendleton. Sociology; the Study of Man in Adaptation. Lexington, Mass.: D. C. Heath, 1973.
Dyfyniad MLADoby, John Thomas, et al. Sociology; the Study of Man in Adaptation. D. C. Heath, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.