CARDINAL, Ihejirika. A Reconnaissance of the Philosophical Problem of Knowledge from Protagoras to Kant. International Journal of Social Sciences & Educational Studies, [S. l.], v. 7, n. 2, p. 29–39, 2020. DOI: 10.23918/ijsses.v7i2p29. Disponível em: https://ijsses.tiu.edu.iq/index.php/ijsses/article/view/335. Acesso em: 18 apr. 2026.