World Bank, ebrary, Inc, & Gertler, P. (2011). Impact evaluation in practice. World Bank.
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Dyfyniad Arddull Chicago
World Bank, Inc ebrary, and Paul Gertler. Impact Evaluation in Practice. Washington, D.C.: World Bank, 2011.
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Dyfyniad MLA
World Bank, et al. Impact Evaluation in Practice. World Bank, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.