SITUMEANG, R. R.; ANTONI, A.; PATRICIA, J.; REINALDO, D. The Influence of Service Quality, Distribution Channels, and Promotion on Sales Volume at PT Delta Agro Makmur Medan. Jurnal Mantik, [S. l.], v. 4, n. 2, p. 1356-1360, 2020. DOI: 10.35335/mantik.Vol4.2020.950.pp1356-1360. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/950. Acesso em: 18 apr. 2026.