Iskandar, T., and A. C. K. Fitri. “Thermal Energy Conversion in Making Biochar from Jengkok Tobacco Waste Using Pyrolysis Extrusion Model”. Jurnal Teknik Kimia Dan Lingkungan, vol. 6, no. 2, Oct. 2022, pp. 147-53, doi:10.33795/jtkl.v6i2.341.