Lestari, Dian Fajar, et al. “ANALISIS DIFUSI LARUTAN PUPUK MELALUI DINDING MORTAR ARANG SEKAM PADI”. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), vol. 5, no. 3, Feb. 2017, https://jtep.fp.unila.ac.id/index.php/JTP/article/view/1321.