SUYOTO, R. S. Analysis of the Influence of Product Costs and Promotional Costs on Sales Volume. INTERNATIONAL CONFERENCE OF ECONOMICS AND BUSINESS, [S. l.], v. 1, n. 1, 2025. Disponível em: https://conference.upgris.ac.id/index.php/EconBiz/article/view/6516. Acesso em: 30 jan. 2026.