MCASHEN, H. H. A Cooperative Study of the Achievement Effects on Third Grade Students Caused by Lengthening the School Day. Florida Journal of Educational Research, [S. l.], v. 5, n. 1, p. 9–18, 1963. DOI: 10.62798/PWQM3671. Disponível em: https://journals.flvc.org/fjer/article/view/134035. Acesso em: 10 may. 2026.