N. R. I. Syah, I. Suyitno, A. E. Anggraini, S. R. Kusumaningrum, and R. Ekawati, “Exploring Self-Confidence in English Skills and Informal Digital Learning Frequency: A Study of Indonesian Elementary Students ”, JOLLS. Lang. Liter. Studies, vol. 5, no. 2, pp. 427–438, Jun. 2025, doi: 10.36312/jolls.v5i2.2415.