Harnack, R. V. (1964). Group discussion: Theory and technique. Appleton-Century-Crofts.
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Dyfyniad Arddull Chicago
Harnack, R. Victor. Group Discussion: Theory and Technique. New York: Appleton-Century-Crofts, 1964.
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Dyfyniad MLA
Harnack, R. Victor. Group Discussion: Theory and Technique. Appleton-Century-Crofts, 1964.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.