Alizade, A., Javanmardi, J., Abdollahzade, N., and Liaghati, Z. 2008. Consumers` awareness, demandsand preferences for organic vegetables: A survey study in Shiraz,Iran. 16th IFOAM Organic World Congress, Modena, Italy, June 16-20.
Amemiya, T. 1985. Advanced econometrics. Cambridge, Massachusetts, Harvard University Press.
Baba’akbari, M., Asadi, A., Akbari, M., Fakharzadeh, A., and Sokhtanlou, M. 2008. Taking attitude of the factors influencing the adoption of organic agricultural products. Agricultural Economics and Development 39: 133-144.
Bengtsson, J., Ahnström J., and Weibul, A.C.2005. The effects of organic agriculture onbiodiversity and abundance: a meta-analysis.Journal of Applied Ecology 42: 261–269.
Dabbert, S., Häring, A.M., and Zanoli, R. 2004.Organic farming: policies and prospects.London: Zed Books.
Davidson, R., and MacKinnon, J.G. 1993. Estimation and inference in econometrics. Oxford University Press.
Elroy, M.B. 1977. Goodness of fit for Seemingly Unrelated Regressions: Glahn's R2 y, x and Hooper's r~2. Journal of Econometrics 6 (3): 381-387.
Enanoglu, Z., and Karahan, O. 2002. Policy implementations for organic agriculture in Turkey. British Food Journal 104: 300-318.
Ghorbani, M. 2009. Supportive policies of greenhouse organic cucumber production in Khorasan Razavi province. Asian Journal of Plant Sciences 8 (1): 42-47.
Ghorbani, M., Koocheki, A.R., and Mahmoudi, H. 2009. The virtual estimation of wheat yield in organic production conditions: (Case study Khorasan Razavi province). Journal of Environmental Sciences 6 (3): 23-30.
Haghjou, M., Hayati, V., Mohammad Rezai, R., Pishbahar, A., and Dashti, Q. 2011. Potential factors influencing consumers' willingness to pay increased rates for healthy food products. Case Study: Employees Agriculture Organization of East Azerbaijan Province. Journal of Agricultural and Sustainable Production 21 (3): 107-117.
Idda, L., Madau, F.A., and Pulina, P. 2008. The Motivational Profile of Organic Food Consumers: a Survey of Specialized Stores Customers in Italy, presented at the 2008 International Congress, August 26-29, 2008, Ghent, Belgium.
Shahpouri, A.R. 2013. Organic products position in the future Consumption basketand Effective structures (case study). MS dissertation. Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. (In Persian with English Summary).
Underhill, S., and Figuera, E. 1996. Consumer prefence FO non-conventionally grown produce. Journal of Food Distribution Research 27: 56-66.
Zellner, A.1962. An efffincient method of estimating seeminglyunrelated regressions and tests of aggregation bias. Journal of American Statistical Association 57: 500-509.