BELACHEW, W.; BARKE, H.-D.; YITBAREK, S. Effects of conceptual change instructional approach on achievement of pre-service chemistry teachers in Aliphatic hydrocarbon concepts. African Journal of Chemical Education, [S. l.], v. 8, n. 2, p. 7–23, 2018. Disponível em: https://www.ajol.info/index.php/ajce/article/view/176067. Acesso em: 14 sep. 2026.