Elkashif, M., Suliman, S., & Elamin, O. (2016). Effects of nitrogen source and effective micro-organisms on vegetative growth of shrubs of selected grapefruit (Citrus paradisi Macf) cultivars. المجلة الزراعية, 14(1). مسترجعة من http://journals.uofg.edu.sd/index.php/gjas/article/view/903