Ward, W. A., Deren, B. J., & D'Silva, E. H. (1991). The economics of project analysis: A practitioner's guide. World Bank.
芝加哥风格引文Ward, William A., Barry J. Deren, 与 Emmanuel H. D'Silva. The Economics of Project Analysis: A Practitioner's Guide. Washington, D.C: World Bank, 1991.
MLA引文Ward, William A., et al. The Economics of Project Analysis: A Practitioner's Guide. World Bank, 1991.
警告：这些引文格式不一定是100％准确.