Bryman, A. (2001). Social research methods. O.U.P.
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Dyfyniad Arddull Chicago
Bryman, Alan. Social Research Methods. New York: O.U.P, 2001.
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Dyfyniad MLA
Bryman, Alan. Social Research Methods. O.U.P, 2001.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.