ONOJAH, D. M.; OKORO, E. Assessment of Availability and Utilization of Instructional Materials for Teaching Preschool Children with Hearing Impairment Mathematics in Oyo State, Nigeria. African Journal of Humanities and Contemporary Education Research , [S. l.], v. 10, n. 1, 2023. Disponível em: https://publications.afropolitanjournals.com/index.php/ajhcer/article/view/442. Acesso em: 26 oct. 2025.