Ully Arti Damanik, Ully, and Sri Wahyuti. “Analisis Komparatif Rasio Profitabilitas Sebelum Dan Saat Adanya Pandemi Covid-19 Pada PT Ultrajaya Milk Industry & Trading Company Tbk Tahun 2019-2021”. OBOR: Oikonomia Borneo 5, no. 1 (June 26, 2023): 104–118. Accessed April 24, 2026. https://ojs.uwgms.ac.id/index.php/oikonomia/article/view/2133.