Dumadi, Veronika Hutapea, Roni, Nasiruddin, and Nur Afridah. “Pengaruh Biaya Produksi, Harga Dan Biaya Promosi Terhadap Omzet Penjualan: (Studi Kasus: Industri Opak Desa Malahayu) ”. Journal of Accounting and Finance (JACFIN) 3, no. 1 (February 11, 2021): 36–45. Accessed April 17, 2024. https://jurnal.umus.ac.id/index.php/jacfin/article/view/373.