Stecher,Brian M. (1987). How to focus an evaluation (ed.). Sage Publications.
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Dyfyniad Arddull Chicago
Stecher,Brian M. How to Focus an Evaluation. ed. Newbury Park: Sage Publications, 1987.
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Dyfyniad MLA
Stecher,Brian M. How to Focus an Evaluation. ed. Sage Publications, 1987.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.