Tume Atua, T., D. Lateef Dahham, y I. 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, Vol. 35, octubre de 2019, pp. 1173-98, https://produccioncientificaluz.org/index.php/opcion/article/view/31944.