N. Susi, S. Surtinah, and M. Rizal, “Pengujian Kandungan Unsur Hara Pupuk Organik Cair (POC) Limbah Kulit Nenas”, J. Ilm. Pertan., vol. 14, no. 2, pp. 46–51, Mar. 2018, doi: 10.31849/jip.v14i2.261.