E. Ogbe, S., M. . Akor-Dewu, M. I. Saleh, E. D. Eze, M. N. Ugwu, O. . Olufunke, A. . Shaibu, and I. S. Malgwi. “Effects of Headphones on Hearing Acuity of Students of Ahmadu Bello University, Zaria, Nigeria”. Scientific Journal of Environmental Sciences, vol. 3, no. 1, Jan. 2014, pp. 5-8, http://sjournals.com/index.php/sjes/article/view/1254.