ZERTUCHE, A.; GERARD, L.; LINN, M. C. How do openers contribute to student learning?. International Electronic Journal of Elementary Education, [S. l.], v. 5, n. 1, p. 79–92, 2017. Disponível em: https://iejee.com/index.php/IEJEE/article/view/11. Acesso em: 30 jan. 2025.