Br. Marpaung, Mahyuni, Siti Aisyah Hanim, and Maulidawati. “Illocutionary Acts of Speech in the Customary Marriage of the Toba Batak Community on the Use of Umpasa in Aek Song-Songan District, Asahan Regency”. Journal of Practice Learning and Educational Development 6, no. 1 (April 8, 2026). Accessed April 30, 2026. https://digitalpress.gaes-edu.com/index.php/jpled/article/view/706.