Benbrahem, D., and FarhiM. . “The Role of Marketing Communication Skills in Developing and Enhancing loyalty. Case Study - Orascom Telecom Algeria (OTA) "Djezzy"”. Dirassat Journal Economic Issue, Vol. 6, no. 2, Apr. 2020, pp. 33-55, doi:10.34118/djei.v6i2.386.