The Effect Of Co-Op-Co-Op Learning Model Towards Students’ Self Efficacy In Speaking Competence. JUPE : Jurnal Pendidikan Mandala, [S. l.], v. 5, n. 5, 2020. DOI: 10.58258/jupe.v5i5.1620. Disponível em: https://ejournal.mandalanursa.org/index.php/JUPE/article/view/1620. Acesso em: 24 jun. 2026.