Kása, K., M. G. Tóth, and M. Hevesi. “Historical Apple Cultivars That Display High Level of Resistance to Fire Blight”. International Journal of Horticultural Science 10, no. 3 (August 13, 2004): 19-23. Accessed September 27, 2020. https://ojs.lib.unideb.hu/IJHS/article/view/498.