CULPUPPER, Leon R. Achievement in Schools Employing Nongraded, Modified Traditional, and Selective Grouping Plans of Organization. Florida Journal of Educational Research, [S. l.], v. 6, n. 1, p. 49–56, 1964. Disponível em: https://journals.flvc.org/fjer/article/view/134026. Acesso em: 7 dec. 2024.