“Liquid Fuel From Polypropylene Plastic Wastes With Bentonite As Catalyst by Catalytic Cracking Process”. ALKIMIA : Jurnal Ilmu Kimia Dan Terapan, vol. 5, no. 2, Aug. 2021, pp. 141-9, https://doi.org/10.19109/alkimia.v5i2.10239.