Wazis, Dr (Mrs) Ruth Haruna, Dr Yagana Imam, and Abubakar Musa Gassol. 2016. “‘Strategies For Winning Customer In A Competitive Market Environment’ (A Case Study Of Mtn Nigeria Ltd)”. International Journal Of Management And Economics Invention 2 (09):1023-29. http://www.rajournals.in/index.php/ijmei/article/view/253.