ALWIN, Robert H.; HOPPER, June C.; JOHNSON, Herbert L. The Effect of Programmed Instruction on Achievement in Beginning Algebra. Florida Journal of Educational Research, [S. l.], v. 6, n. 1, p. 3–10, 1964. Disponível em: https://journals.flvc.org/fjer/article/view/134021. Acesso em: 17 feb. 2025.