NURFAI, N. A. F. The Effect of Promotion Cost and The Fixed Price on Sales Level of The PT. Aston Inti Makmur. Mulia Pratama Jurnal Ekonomi dan Bisnis , [S. l.], v. 1, n. 1, p. 1-10, 2023. Disponível em: https://ejournal.stiemp.ac.id/mp/article/view/138. Acesso em: 13 jan. 2025.