FERRER, Ferran. El sistema educativo de la U.R.S.S. EDUCAR, Cerdanyola del Vallès, Spain, v. 3, p. 87–108, 1983. DOI: 10.5565/rev/educar.555. Disponível em: https://educar.uab.cat/article/view/v3-ferrer. Acesso em: 3 abr. 2025.