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)”. International Journal of Economics and Management Research, vol. 5, no. 2, May 2026, pp. 636-43, doi:10.55606/ijemr.v5i2.838.