Nasution, H., H. Ismail, and E. Ellsworth. “Rheological Properties of Polystyrene/Polypropylene (PS/PP) Blends: The Effects of Various Compatibilizers”. Simetrikal: Journal of Engineering and Technology, vol. 1, no. 1, Jan. 2019, pp. 1-11, doi:10.32734/jet.v1i1.681.