Tume Atua, Tarek, Dahham Lateef Dahham, y Ihsan Salim Mesr. «The Role of Quality of Service As a Tool to Achieve Relationship Marketing. An Empirical Study of a Sample of Mobile Phone Company (Asiacell) Customers in Anbar Governorate». Opción 350 (octubre 19, 2019): 1173-1198. Accedido junio 9, 2025. https://mail.produccioncientificaluz.org/index.php/opcion/article/view/31944.