APA

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

Chicago

Ward William A, Deren Barry J and D'Silva Emmanuel H. 1991. The economics of project analysis. Washington, D.C: World Bank.

Harvard

Ward W. A., Deren B. J. and D'Silva E. H. (1991). The economics of project analysis. Washington, D.C: World Bank.

MLA

Ward William A, Deren Barry J and D'Silva Emmanuel H. The economics of project analysis. Washington, D.C: World Bank. 1991.