SOVIYAH, S.; AKHSAN, N. R. Boosting Students’ Vocabulary through Index Card. Journal of English and Education (JEE), [S. l.], v. 2, n. 2, 2008. DOI: 10.20885/jee.v2i2.6462. Disponível em: https://journal.uii.ac.id/JEE/article/view/6462. Acesso em: 2 may. 2024.