IBRAHIM, Adamu; MALAMI, Hussaini Usman; ABDULLAHI, A. S. AN EMPIRICAL ANALYSIS ON THE OPERATIONAL CHALLLENGES OF INTEREST FREE BANKING WINDOW IN NIGERIA: A CASE STUDY OF KEYSTONE BANK LIMITED IN NASARAWA STATE. European Scientific Journal, ESJ, [S. l.], v. 8, n. 15, 2012. DOI: 10.19044/esj.2012.v8n15p%p. Disponível em: https://test.eujournal.org/index.php/esj/article/view/239. Acesso em: 19 apr. 2025.