Abedi Sarvestani, A. & Shahvali, M. 2009. Journal of Ethics in Science and Technology, 3(3-4): 56-61. (In Persian)
Brezina, D.; Hlavackova, P. & Fialova, J. 2017. Economic evaluation of recreational use of forests roads on the example of Pisek City Forests Ltd. Folia Forestalia Polonica, 59(4): 312-320.
Cochran, W.G. 1977. Sampling techniques (3rd edn). New York, John Wiley & Sons.
Dashti, Gh. & Sohrabi, F. 2009. Recreational value of Nabovat Park of Karaj based on contingent valuation. Journal of Natural Environment (Iranian Journal of Natural Recources), 61(5): 921-932. (In Persian)
Davis, R. 1963. The value of outdoor recreation: an economic study of the marine woods. PhD Thesis, Harvard University.
Fattahi, A. & Fathzade. 2011. Protective assessment of watersheds using conditional valuation method (Case study: Gomishan wetland). Iranian Journal of Watershed Management Science and Engineering, 5(17): 47-52. (In Persian)
Forests, Rangelands and Watershed Management Organization. 2017. Statistics and Information Office. (In Persian)
Gravitiani, E. & Raharjo, M. 2019. Payment for environmental service of conservation in Cokro Tulung spring, Klaten regency, Indonesia. In MATEC Web of Conferences (Vol. 270, p. 04002), EDP Sciences.
Han, F.; Yang, Z.; Wang, H. & Xu, X. 2011. Estimating willingness to pay for environment conservation: a contingent valuation study of Kanas Nature Reserve, Xinjiang, China. Environmental Monitoring and Assessment, 180(1-4): 451-459.
Heydari Chianeh, R.; Raheli, H. & Fekri, F. 2017. Evaluation of Urban Tourism Attractions through Contingent Valuation Method (CVM), Shorabil Attractions Case Study in Ardabil. Urban Tourism Quarterly, 4 (1): 57-70. (In Persian)
Inglehart, R. 1995. Public support for environmental protection: Objective problems and subjective values in 43 societies. PS: Political Science & Politics, 28(1): 57-72.
Iran Environment Organization. 2017. (In Persian)
Jalilov, S. M. 2018. Value of Clean Water Resources: Estimating the Water Quality Improvement in Metro Manila, Philippines. Resources, 7(1): 1.
Juwana, I. & Albar, M. S. 2019. The improvement of solidwaste management in Cibodas Botanical Garden through environmental economic valuation using the travel cost method. In E3S Web of Conferences (Vol. 76, p. 03001), EDP Sciences.
Larrue, C. 2000. Analyser les politiques publiques d'environnement. Editions L'Harmattan.
Lee, C. & Han, S. 2002. Estimating the use and preservation values of national parks tourism resources using a contingent valuation method, Tourism Management, 23: 531-540.
Lizinski, T.; Wroblewska, A. & Rauba, K. 2015. Application of CVM method in the evaluation of flood control and water and sewage management projects. Journal of Water and Land Development, 24(1), 41-49.
Mamat, M. P.; Yacob, M. R.; Radam, A.; Ghani, A. N. A. & Fui, L. H. 2013. Willingness to pay for protecting natural environments in Pulau Redang Marine Park, Malaysia. African Journal of Business Management, 7(25): 2420-2426.
Modaberi, A.; Mahvadi, A. & Amirnejad, H. 2018. Estimating the Outdoor Recreation Value of Ghaleh gol Forest Area of Lorestan Using Contingent Valuation Method. Journal of Wood and Forest Science and Technology, 25(1): 149-168. (In Persian)
Mosavi, S.N. 2015. Estimation of Economic-resort Valuation of Khafr Waterfall and Recreational area by Determining Effective Factors on Willingness to pay by Using CVM. Journal of Regional Planning, 5(18): 157-170. (In Persian)
Ntanos, S.; Kyriakopoulos, G.; Chalikias, M.; Arabatzis, G. & Skordoulis, M. 2018. Public perceptions and willingness to pay for renewable energy: A case study from Greece. Sustainability, 10(3), 687.
Reisi, L. 2009. The relationship between environmental protection and peace and sustainable development. Literature and Humanities (Faculty of Literature and Humanities, Shahrekord University), (10-11): 109-134. (In Persian)
Resende, F. M.; Fernandes, G. W.; Andrade, D. C. & Néder, H. D. 2017. Economic valuation of the ecosystem services provided by a protected area in the Brazilian Cerrado: application of the contingent valuation method. Brazilian Journal of Biology, (AHEAD), 0-0.
Salami, H. & Rafiee, H. 2011. Estimation of Preservation Value of Anzali International Wetland Based on Deontological Pointview. Journal of Natural Environment (Iranian Journal of Natural Recources), 64(2): 89-100. (In Persian)
Samdaliry, A.; Amirnejad, H. & Mortazavi, S. A. 2014. Residents' Willingness-to-Pay (WTP) for Preservation of Valasht Lake of Chalous City by Using One-and-One-Half-Bound Dichotomous Choice Contingent Valuation Method. Iranian Journal of Applied Ecology, 5(2): 1-13. (In Persian)
Statistical Center of Iran. 2017. General Census of Housing Population. (In Persian)
Tao, Z.; Yan, H. & Zhan, J. 2012. Economic valuation of forest ecosystem services in Heshui watershed using contingent valuation method. Procedia Environmental Sciences, 13: 2445-2450.
Yegane, H.; Yari, R.; Sanayi, A. & Ahmad yusefi, S. 2017. Evaluating economical values of natural recreational places and investigating effective variables on willingness to pay of individuals for natural recreation activities (Case study: Charbagh rangelands of the Gorgan). Journal of Rangeland, 11(1): 57-72. (In Persian)
Yu, B.; Cai. Y.; Jin. L. & Du, B. 2018. Effects on Willingness to Pay for Marine Conservation: Evidence from Zhejiang Province, China. Sustainability, 10(7), 2298.
Zhonghua, C. & Yu, S. 2011. Environmental Protection Investment and Sustainable Development-Policy Simulation Based on Nonlinear Dynamics. Energy Procedia, 5: 467-471.