SUPRIADI, L. B. .; FIKRIAH, N. L. The effectiveness analysis of direct marketing strategies at PT. Bathi Dua Putra, Balikpapan City. Jurnal Mantik, [S. l.], v. 7, n. 3, p. 2799-2808, 2023. DOI: 10.35335/mantik.v7i3.4424. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/4424. Acesso em: 31 jul. 2026.