Bateman, I. J., R. T. Carson, B. Day, M. Hanemann, N. Hanley, T. Hett, M. Jones-Lee, G. Loomes, S. Mourato, E.Ozdemiroglu, D. W. Pearce, R. Sugden and J. Swanson. (2002). Economic valuation with stated preference techniques. Edward Elgar Pub.,Cheltenham, UK. Northampton, MA, USA.
Bishop, R. C. and Heberlein, T. A. (1979). Measuring values of extra–market goods: are indirect measures biased? American Journal of Agricultural Economics,vol (61): 926–30.
Bishop, R., Boyle, K. and Walsh, M. (1983). "The role of question order and respondent experience in contingent valuation studies". Journal of Environmental Economics and Management, 25(1): 80-99.
Bockstael, N.E., McConnell, K. E. and Strand, I. E. (1999). “Measuring the Benefits of Improvements in Water Quality: The Chesapeake Bay”, Marine Resource Economics, 6(1): 1-18.
Brouwer, R. Barton, B. Bateman,I. Brander, L. Georgiou, S. Ortega.J.M. Navrud, S. Velazquez,M,P. Schaafsma, M. Wagtendonk, A. (2009). Economic Valuation of Environmental and Resource Costs and Benefits in the Water Framework Directive: Technical Guidelines for Practitioners. EU funded project AquaMoney,1-240.
Chi-Ok Oh; Dixon, A; Mjelde J and Draper, J.(2008). Valuing visitors economic benefits of public beach access points. Ocean & Costal Management. 51: 847-853
Cline, A (2000). prioritization Process Using Delphi Technique, [Online] Available:http://www. carola.com/wp-delphi.htm
Cochran, W. G.(1997). Sampling Techniques . Whley & Sons,Inc, USA, 428 PP
Cooper, J. C., Hanemann, M. and Signorello, G. (2002). "One-and-One-Half-Bound Dichotomous- Choice Contingent Valuation." The Review of Economics and Statistics, 84 (4): 742-750
Edington W, and Redman, M (1999). Economics and tourism; Annals of tourism research. Vol 18:41-56
Hanemann, W. M. (1984). Welfare Evaluations in Contingent Valuation Experiments with Discrete Responses. American Journal of Agricultural Economics, Vol. 66, No. 3 (Aug., 1984), pp. 332-341
James, B.(1984). An efficient R-Estimator for the ED50. Journal of American Statistical Assaiation (79),164-73
Ladenburg, J; and dubgard, A. (2007). Willingness to pay for reduced visual disamenities from offshore wind farms in Denmark. Energy Policy.35:4059-4071
Ludwig, L. (2005). Library as place: results of a Delphi study. J Med Assoc 93(3) july, [Online] Available: www. Pubmedcentral.nih.gov/articlerender.fcgi?artid= 1175798;
Marzetti, s; and Brandolini, A.(2006). Investing in biodiversity: The recreational value of a natural coastal area. Chemistry and Ecology .Vol 22,pp:s443-s462
Mitchell, R. and Carson, R. (1989). Using Surveys to Value Public Goods: The Contingent Valuation Method. Johns Hopkins University Press for Resources for the Future, Washington DC.
Morgan, N (1999). Preferences and Priorities of Recreational Beach Users in Wales,UK. Journal of Coastal Research.653-667
Venkatachalam, L.(2003). The contingent valuation Method: a Review. Environmental Impact Assessment Review, 24:pp 89-124
