1. Ardilla, S., 1993. Guia para la utilizacion de modelos econométricos en aplicaciones del método de valoración contingente. Environmental Division Working Paper ENP-101. Inter-American Development Bank, Washington, DC.
2. A semiparametric distribution for willingness to pay and statistical inference with dichotomous choice contingent valuation data;An;American Journal of Agricultural Economics,2000
3. Valuing Environmental Preferences: Theory and Practice of the Contingent Valuation Method in the US, EC and Developing Countries,1999
4. Bayes, A., von Braun, J., Akhter, R., 1999. Village Pay Phones and Poverty Reduction: Insights from a Grameen Bank Initiative in Bangladesh, ZEF Discussion Paper 8, Bonn University.
5. Estimating willingness to pay: why and how?;Bohm;Scandinavian Journal of Economics,1979