Suud, Hasbi Mubarok, et al. “Pengembangan Model Pendugaan Kadar Hara Tanah Melalui Pengukuran Daya Hantar Listrik Tanah”. Jurnal Keteknikan Pertanian, vol. 3, no. 2, Jan. 2016, https://doi.org/10.19028/jtep.03.2.%p.