From Spencer’s Happy Education to Modern Education Reform. International Journal of Educational Development, [S. l.], v. 3, n. 1, p. 34–41, 2026. DOI: 10.63313/IJED.9056. Disponível em: https://academics.erytis.com/index.php/IJED/article/view/420. Acesso em: 20 apr. 2026.