Sudarto, Sudarto. “STRATEGI MARKETING MIX DENGAN KONSEP 4P (PRICE, PRODUCT, PLACE, PROMOTION) DI PT.OXYPLAST INDONESIA”. SISTEM Jurnal Ilmu Ilmu Teknik 19, no. 1 (April 27, 2023): 37 - 44. Accessed June 25, 2025. https://sistem.wisnuwardhana.ac.id/index.php/sistem/article/view/246.