Chukwu, A. 2021. THE EFFECTS OF CUSTOMER RELATIONSHIP MARKETING ON CUSTOMER LOYALTY OF GLOBAL SYSTEM OF MOBILE COMMUNICATION SERVICES. ( A STUDY OF NETWORK SERVICE PROVIDERS IN NIGERIA). GPH-International Journal of Business Management. 4, 04 (Apr. 2021), 01-20. DOI:https://doi.org/10.5281/zenodo.6866509.