Lumbangaol, Stevanie, Uus Karwati, and Diah Latifah. “Vokal Tradisi Batak Toba œAndung”. Gondang: Jurnal Seni dan Budaya 3, no. 1 (June 1, 2019): 50–55. Accessed May 21, 2025. http://103.242.233.34/2012/index.php/GDG/article/view/13182.