KELLER, Martin. Reisinger, Christa-Monika (2007). Unterrichtsdifferenzierung. Swiss Journal of Educational Research, Bern, v. 30, n. 2, 2008. DOI: 10.24452/sjer.30.2.5317. Disponível em: https://sjer.ch/article/view/5317. Acesso em: 12 mar. 2025.