Leni Handayani, Nomi Noviani, Sri Wahyuni. “ Organic Fertilizer Treatments Effect on the Soybean Growth (Glycine Max L.Merr) ”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, June 2020, pp. 13386-95, http://sersc.org/journals/index.php/IJAST/article/view/25986.