Sofyan, E. T. (2017) “Uji Efektivitas Pupuk An-Organik Ammonium Klorida ‘BUMI IJO’ Terhadap Tanaman Jagung (Zea mays L.)”, Agropross : National Conference Proceedings of Agriculture, 1, hlm. 17–29. doi: 10.25047/agropross.2017.41.