Ward, W. A., Deren, B. J., & D'Silva, E. H. (1991). The economics of project analysis: A practitioner's guide. World Bank.
Lua i Stíl Chicago (17ú heag.)Ward, William A., Barry J. Deren, agus Emmanuel H. D'Silva. The Economics of Project Analysis: A Practitioner's Guide. Washington, D.C: World Bank, 1991.
Lua MLA (9ú heag.)Ward, William A., et al. The Economics of Project Analysis: A Practitioner's Guide. World Bank, 1991.
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