SALSABILA, Januba Roudloh; SUMARDI, Sumardi; PUTRA, Kristian Adi. English Self-Efficacy in a Faith-Based Multilingual Boarding School: A Qualitative Case Study from Indonesia. FOSTER: Journal of English Language Teaching, [S. l.], v. 7, n. 1, p. 146–161, 2026. DOI: 10.24256/foster-jelt.v7i1.330. Disponível em: https://foster.pbi-iainpalopo.ac.id/index.php/contents/article/view/330. Acesso em: 16 oct. 2026.