Ariasih, P. R., Gusti Made Sutjaja, and N. W. Kasni. “The Superstructure of Public Service Advertisements on Plastic Waste”. RETORIKA: Jurnal Ilmu Bahasa, Vol. 6, no. 1, Apr. 2020, pp. 50-56, doi:10.22225/jr.6.1.1294.50-56.