VALATKIENĖ, Stasė. Historical Development of Research Method. Acta Paedagogica Vilnensia, [S. l.], v. 11, p. 36–43, 2003. DOI: 10.15388/ActPaed.2003.11.9596. Disponível em: https://journals.vu.lt./acta-paedagogica-vilnensia/article/view/9596. Acesso em: 27 apr. 2025.