Analysis of Duolingo Application Usability Based on the System Usability Scale (SUS). Secure And Knowledge-Intelligent Research in Cybersecurity And Multimedia (SAKIRA), Mataram, Nusa tenggara barat, v. 4, n. 01, 2026. DOI: 10.36679/s4kira.v4i1.79. Disponível em: https://sakira.unizar.ac.id/index.php/jurnal/article/view/79.. Acesso em: 25 jul. 2026.