APA (7e ed.) Bronvermelding

Ward, W. A., Deren, B. J., & D'Silva, E. H. (1991). The economics of project analysis: A practitioner's guide. World Bank.

Chicago (17e ed.) Bronvermelding

Ward, William A., Barry J. Deren, en Emmanuel H. D'Silva. The Economics of Project Analysis: A Practitioner's Guide. Washington, D.C: World Bank, 1991.

MLA (9e ed.) Bronvermelding

Ward, William A., et al. The Economics of Project Analysis: A Practitioner's Guide. World Bank, 1991.