?zlem Karahan Uysal, M. Janssen, B. M?ran, C. Abay, M. Boyaci, și U. Hamm, „Consumer Willingness-To-Pay for Different Organic Certification Logos in Turkey”, rcis, vol. 39, pp. 154–175, dec. 2012, Data accesării: nov. 07, 2026. Disponibil la: https://www.rcis.ro/journal/article/view/704-consumer-willingness-to-pay-for-different-organic