Brányi, Árpád, and László Józsa. “The Influence of Social Capital on Product Policy: A Case for Cooperation Among Transdanubian Wineries”. The Hungarian Journal of Marketing and Management, vol. 50, no. 2, Oct. 2019, pp. 31-44, https://journals.lib.pte.hu.testing.qulto.eu/index.php/mm/article/view/897.