Santoso, B., A. P. Permatasari, S. Pratama, P. Susmanto, and R. Y. B. . Ningsih. “Valorization of Waste Cooking Oil into Liquid Organic Fertilizer by Anaerobic Fermentation Method”. Jurnal Teknik Kimia Dan Lingkungan, vol. 7, no. 1, Apr. 2023, pp. 39-47, doi:10.33795/jtkl.v7i1.356.