Abdulwahab, L., and U. Usman. “DESIGN OF A PROTOTYPE MOBILE PHONE FOR VISUAL IMPAIRED PEOPLE”. FUDMA JOURNAL OF SCIENCES, vol. 1, no. 1, Mar. 2023, pp. 128 -38, https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1235.