Carson, R.T.; Mitchell, R.C.; Hanemann, W.M.; Kopp, R.J.; Presser, S. and Ruud, P.A. (1992): A Contingent Valuation Study of Lost Passive Use Values Resulting From the Exxon Valdez Oil Spill. Unpublished.
Cooper, Joseph C.; Hanemann, W.M. and Signorello, Giovanni (2002): One and One-Half Bound Dichotomous Choice Contingent Valuation. Published in: Review of Economics and Statistics , Vol. 84, (November 2002): pp. 742-750.