Toruan, Hubert Mulya Sari Lumban, and Sienly Veronica. “Analisis Harga Pokok Penjualan Dan Cukai Rokok Terhadap Net Profit Margin”. Jurnal Informatika Ekonomi Bisnis 6, no. 3 (September 30, 2024): 653-657. Accessed December 8, 2025. https://infeb.org/index.php/infeb/article/view/884.