RUTH MELODY MISBOW SIALLAGAN; MAULY PURBA; VANESIA AMELIA SEBAYANG; JUNITA BATUBARA. THE SINGING CHURCH: AN ANALYSIS OF VOCAL DEVIATIONS IN CONGREGATIONAL SINGING - A STUDY OF HKBP CONGREGATIONAL SINGING TECHNIQUES. Multidiciplinary Output Research For Actual and International Issue (MORFAI), [S. l.], v. 6, n. 2, p. 1371–1378, 2025. DOI: 10.54443/morfai.v6i2.4843. Disponível em: https://radjapublika.com/index.php/MORFAI/article/view/4843. Acesso em: 1 mar. 2026.