SINAGA, Theodora. Dasar-Dasar Teknik Bernyanyi Opera. Gondang: Jurnal Seni dan Budaya, [S. l.], v. 2, n. 2, p. 79–89, 2018. DOI: 10.24114/gondang.v2i2.11284. Disponível em: http://103.242.233.34/index.php/GDG/article/view/11284. Acesso em: 23 feb. 2025.