Avila, D. (1977). The helping relationship sourcebook (2nd ed.). Allyn and Bacon.
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Dyfyniad Arddull Chicago
Avila, Donald. The Helping Relationship Sourcebook. 2nd ed. Boston: Allyn and Bacon, 1977.
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Dyfyniad MLA
Avila, Donald. The Helping Relationship Sourcebook. 2nd ed. Allyn and Bacon, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.