Sofyan, Emma Trinurani, dkk. “Uji Efektivitas Pupuk An-Organik Ammonium Klorida ‘BUMI IJO’ Terhadap Tanaman Jagung (Zea Mays L.)”. Agropross : National Conference Proceedings of Agriculture, vol. 1, November 2017, hlm. 17-29, doi:10.25047/agropross.2017.41.