Pet, E., I. Pet, L. M. Gorun, and A. C. Cazan. “A Study on consumers’ Interest in Purchasing Biological Produce”. Review on Agriculture and Rural Development, vol. 3, no. 1, Jan. 2014, pp. 187-92, https://ojs.bibl.u-szeged.hu/index.php/rard/article/view/13420.