., Purwarno, A Suhendi, and Azmir . “Nias Traditional Ceremonies in J. A. Sonjaya’s Novel Manusia Langit”. KnE Social Sciences 3, no. 4 (April 19, 2018): 720–729. Accessed August 6, 2020. https://knepublishing.com/index.php/KnE-Social/article/view/1980.