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Dyfyniad Arddull ChicagoPatton, Michael Quinn. Utilization-focused Evaluation. 2nd ed. Beverly Hills: Sage Publications, 1986.
Dyfyniad MLAPatton, Michael Quinn. Utilization-focused Evaluation. 2nd ed. Sage Publications, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.