Karahan Uysal, ?zlem, et al. „Consumer Willingness-To-Pay for Different Organic Certification Logos in Turkey”. Revista de Cercetare si Interventie Sociala, vol. 39, decembrie 2012, pp. 154-75, https://www.rcis.ro/journal/article/view/704-consumer-willingness-to-pay-for-different-organic.