Flora Oktayovie Nuzulul Ramadhina. The Effect of Promotion Costs and Production Costs on Net Sales (Case Study at PT. Unilever Indonesia, Tbk. Period 2016-2023). Ijemr [Internet]. 2026 May 2 [cited 2026 May 2];5(2):636-43. Available from: https://ijemr.asia/index.php/ijemr/article/view/838