Simarangkir, Aprinaldi Patiaraja. “Changes on Structures of Music Presentation in Traditional Ceremony of Toba Batak Communities”. International Journal of English Literature and Social Sciences (IJELS) 4, no. 1 (October 10, 2019). Accessed January 4, 2025. https://journal-repository.com/index.php/ijels/article/view/460.