Nagy, P. T.; Szabó, Z.; Nyéki, J.; Gonda, I.; Holb, I. J. Organic Versus Integrated Apple Growing: I. Differences in Soil and Leaf Parameters. Int. j. hortic. sci. 2009, 15 (4), 57-60. https://doi.org/10.31421/IJHS/15/4/841.