E. W. Saragih, B. Santoso, and P. Purwaningsih, “Pembuatan pupuk organik berbahan baku limbah kotoran sapi dan pelepah kelapa sawit: Utilization of cattle dung and palm oil fond as a raw material of compost”, J. Ig., vol. 5, no. 4, pp. 202–212, Oct. 2024.