WAFIA, N. U.; FURWANTI, R.; LESTARI, D. M. Immaterial Cost and Production: Maximum Production Cost Level Through Marginal Approach. el-Jizya : Jurnal Ekonomi Islam, [S. l.], v. 8, n. 2, p. 128–149, 2020. DOI: 10.24090/ej.v8i2.4241. Disponível em: https://ejournal.uinsaizu.ac.id/index.php/eljizya/article/view/4241. Acesso em: 18 may. 2024.