Desi Lestari, Prih Febtiningsih, and Qonaah Nuryan Arif, “The Correlation Between Informal Peer Communication in English and Students’ Self-Confidence in Speaking English in Class at MAS Pondok Pesantren Syafa’aturrasul”, JUPENSI, vol. 5, no. 3, pp. 156–162, Oct. 2025.