Kholidah, N., M. Faizal, and M. Said. “Polystyrene Plastic Waste Conversion into Liquid Fuel With Catalytic Cracking Process Using Al2O3 As Catalyst”. Science and Technology Indonesia, vol. 3, no. 1, Jan. 2018, pp. 1-6, doi:10.26554/sti.2018.3.1.1-6.