Irvin, George Modern cost-benefit methods : an introduction to financial, economic and social appraisal of development projects / George Irvin . - London : Macmillan Press, 1978 . - VII-257 p. ; 23 cm. - Collection M . Bibliogr.Index. ISBN: 0333232089 Source: 68653 Achat Universal Decimal Class. No.: 338.581