Mafee, H. , , Saleh, I. , and Hosseini, S. S. . "Estimating the Willingness-To-Pay for Organic Products: (A Case Study of Vegetable and Cucumber in Gilan and Tehran Provinces)", Iranian Journal of Agricultural Economics and Development Research, 43, 1, 2012, 11-18. doi: 10.22059/ijaedr.2012.30441