H. T. Rasheed and E. M. Sunday, “Effects of Braille Mathematical Code Instruction and Concrete Materials on Mathematics Performance in Primary School Learners with Total Blindness: A Quasi-Experimental Study in Oyo State, Nigeria”, Nusantara. J. Behav. and. Soc. Sci, vol. 5, no. 1, pp. 37–46, Feb. 2026.