BERHE, G. G.; TESFEMARIAM, G. M. .; WELDEMICHAE, G. H. . Challenges for effective teaching of chemistry in secondary schools of developing countries: A review. African Journal of Chemical Education, [S. l.], v. 14, n. 2, p. 61–100, 2024. Disponível em: https://www.ajol.info/index.php/ajce/article/view/272356. Acesso em: 11 oct. 2026.