1. Binkley, C. (1978) The Recreation Benefits of Water Quality Improvements: An Analysis of Day Trips in an Urban Setting, US Environmental Protection Agency, Washington, DC.
2. Bockstael, N.E., Hanemann, W.M. and Strand, I.E. (1987) Measuring the benefits of water quality improvements using recreation demand models, Environmental Protection Agency Cooperative Agreement CR-811043–01-o.
3. Caswell, M.F. and Zilberman, D. (1986) The effects of well depth and land quality on the choice of irrigation technology, American Journal ofAgricultural Economics
68, 798–811.
4. Caulkins, P.P., Bishop, R.C. and Bouwes, N.W. Sr. (1986) The travel cost model for lake recreation: A comparison of two methods for incorporating site quality and substitution effects, American Journal of Agricultural Economics
68, 291–297.
5. Clawson, M. (1959) Methods of measuring the demand for and value of outdoor recreation, REF Reprint No. 10, Resources for the Future, Washington, DC.