1. Economic valuation of environmental impacts
2. BMZ (1987). Umweltwirkungen von Entwicklungsprojekten. Hinweise zur Umweltverträg-lichkeitsprüfung (UVP). Bonn: Ministry of Economic Cooperation.
3. (1975). ‘Planning models, shadow prices, and project evaluation’. In and (eds) Economy-Wide Models and Development Planning. Oxford: Oxford University Press, pp. 197–211.
4. On the valuation of ‘external effects’ in project appraisal
5. and (1972). Guidelines for Project Evaluation. New York: United Nations.