The Effectiveness Of Writing The Letter Of Gratitude Technique In Reducing The Stress Level Of Islamic Boarding School Student. Psikis : Jurnal Psikologi Islami, [S. l.], v. 7, n. 1, p. 79–85, 2021. DOI: 10.19109/psikis.v7i1.4612. Disponível em: https://jurnal.radenfatah.ac.id/index.php/psikis/article/view/4612.. Acesso em: 1 apr. 2025.