Aningsih Sinambela, Hema Desti, Syamsul Arif, and Malan Lubis. “HATA ANDUNG DALAM OPERA BATAK SIBORU TUMBAGA”. JURNAL SASTRA INDONESIA (SASINDO) 11, no. 2 (January 17, 2023): 24–30. Accessed September 4, 2025. https://jurnal.unimed.ac.id/2012/index.php/sasindo/article/view/42558.