Bertcher Harvey J. (1977). Creating groups (ed.). Sage publications.
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Dyfyniad Arddull Chicago
Bertcher Harvey J. Creating Groups. ed. London: Sage publications, 1977.
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Dyfyniad MLA
Bertcher Harvey J. Creating Groups. ed. Sage publications, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.