1. Abaza, H., & Rietbergen-McCracken, J. (1998). Economic instruments for environmental management: A worldwide compendium of case studies. London, UK: Earthscan Publication.
2. Abedi, Z., Fatahi Ardakani, A., Hanifnejad, A. R., & Dashti Rahmatabadi, N. (2014). Groundwater valuation and quality preservation in Iran: The case of Yazd. International Journal of Environmental Research, 8(1), 213–220.
3. Amir Nejad, H. (2005). Determine the total economic value of the ecosystem of northern forests of Iran with an emphasis on ecological and ecological values and conservation values (Phd dissertation). Faculty of Agriculture, Tarbiat Modares University.
4. Amir Nejad, H., Khalilian, S., Assareh, M. H., & Ahmadian, M. (2006). Estimating the existence value of north forests of Iran by using a contingent valuation method. Ecological Economics, 58(4), 665–675.
5. Amiri, N., Emadian, S. F., Fallah, A., Adeli, K., & Amir Nejad, H. (2015). Estimation of conservation value of Myrtle (Myrtus Communis) using a contingent valuation method: A case study in a Dooreh Forest area, Lorestan Province, Iran. Forest Ecosystems, 2(1), 30.