Padang, N., S. . Irnihsyah Irawan, R. . Atika, J. . Br.Manalu, and J. . Safitri Sitorus. “EFFECT OF PRODUCTION COSTS, PROMOTIONAL COSTS, AND SALES VOLUME ON NET PROFIT IN MANUFACTURING COMPANIES”. Jurnal Ipteks Terapan, vol. 16, no. 3, June 2022, pp. 374-81, doi:10.22216/jit.v%vi%i.1095.