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Dyfyniad Arddull Chicago.Pearce, D. W. The Social Appraisal of Projects: A Text in Cost-benefit Analysis. london: the english language book society and macmillan, 1981.
Dyfyniad MLA.Pearce, D. W. The Social Appraisal of Projects: A Text in Cost-benefit Analysis. the english language book society and macmillan, 1981.
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