Introduction of the Study Effectiveness of Sales Promotion and After Sales Services in B2B Market. Multitech Journal of Applied Sciences (MJAS), [S. l.], v. 1, n. 1, p. 85–116, 2024. DOI: 10.59890/xd36c986. Disponível em: https://penerbitjurnalinternasional.com/index.php/mjas/article/view/380.. Acesso em: 11 feb. 2026.