RASHEED, H. T.; SUNDAY, E. M. 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 Journal of Behavioral and Social Science, Lampung, Indonesia, v. 5, n. 1, p. 37–46, 2026. DOI: 10.47679/njbss.202614851. Disponível em: https://ukinstitute.org/journals/4/njbss/article/view/148. Acesso em: 4 jun. 2026.