Douglas, T. (1978). Basic groupwork. International Univ..
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Dyfyniad Arddull Chicago
Douglas, Tom. Basic Groupwork. New York: International Univ., 1978.
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Dyfyniad MLA
Douglas, Tom. Basic Groupwork. International Univ., 1978.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.