Ibrahim A, Malami HU, Abdullahi AS. AN EMPIRICAL ANALYSIS ON THE OPERATIONAL CHALLLENGES OF INTEREST FREE BANKING WINDOW IN NIGERIA: A CASE STUDY OF KEYSTONE BANK LIMITED IN NASARAWA STATE. ESJ [Internet]. 2012 Jul. 27 [cited 2025 Apr. 19];8(15). Available from: https://test.eujournal.org/index.php/esj/article/view/239