Chukwu A. THE EFFECTS OF CUSTOMER RELATIONSHIP MARKETING ON CUSTOMER LOYALTY OF GLOBAL SYSTEM OF MOBILE COMMUNICATION SERVICES. ( A STUDY OF NETWORK SERVICE PROVIDERS IN NIGERIA). bm [Internet]. 30Apr.2021 [cited 15May2024];4(04):01-0. Available from: https://gphjournal.org/index.php/bm/article/view/394