APA

Walsh R. G., Johnson D. M. & McKean J. R.Isssues in nonmarket valuation and policy application. : .

Chicago

Walsh Richard G, Johnson Donn M and McKean John R.Isssues in nonmarket valuation and policy application. : .

Harvard

Walsh R. G., Johnson D. M. and McKean J. R.Isssues in nonmarket valuation and policy application. : .

MLA

Walsh Richard G, Johnson Donn M and McKean John R.: . .