Lakatos, L., T. Szabó, Z. Szabó, M. Soltész, S. Zhongfu, Y. Wang, and J. Nyéki. “The Effect of Day and Night Temperatures on Apple Skin Colour Formation”. International Journal of Horticultural Science 14, no. 1-2. (February 19, 2008): 21-25. Accessed April 8, 2020. https://ojs.lib.unideb.hu/IJHS/article/view/776.