Poppen, R. (1995). Joseph Wolpe. Sage Publications.
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Dyfyniad Arddull Chicago
Poppen, Roger. Joseph Wolpe. London ; Thousand Oaks, Calif.: Sage Publications, 1995.
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Dyfyniad MLA
Poppen, Roger. Joseph Wolpe. Sage Publications, 1995.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.