Layard, R. (1972). Cost benefit analysis. Penguin Books.
Chicago Edition CitationLayard, Richard. Cost Benefit Analysis. London: Penguin Books, 1972.
Deismireacht MLALayard, Richard. Cost Benefit Analysis. Penguin Books, 1972.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.