Harahap, Rifqah, and Anita Situmorang. “The Influence of Price Promotion and Discounts on Sales: Study at A Medical Device Company in Medan City”. Jurnal Ekonomi, Bisnis & Entrepreneurship (e-Journal) 17, no. 1 (May 25, 2023): 26–34. Accessed December 5, 2024. https://jurnal.stiepas.ac.id/index.php/jebe/article/view/309.