The Effectual use of Customer Retention as a Tool of Customer Relations Management Strategy: A Study of Mtn, Airtel, Glo And Etisalat Communication Customers in UYO Metropolis. Global Journal of Management and Business Research, [S. l.], v. 19, n. B2, p. 41–76, 2019. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/2766. Acesso em: 5 feb. 2026.