Hery Buha Manalu. “Merging With the Universe: The Batak Ritual in the ’Martutu Aek’ Ceremony”. MERDEKA : Jurnal Ilmiah Multidisiplin 1, no. 5 (May 31, 2024): 354–360. Accessed August 16, 2025. https://jurnalistiqomah.org/index.php/merdeka/article/view/1337.