Harahap, Rosni. “The Utilizing Whatsapp Application To Teach Speaking For Students Universitas Graha Nusantara”. ETANIC Journal Of English Language Teaching And Applied Linguistics 1, no. 1 (February 18, 2023): 10–19. Accessed December 13, 2024. https://jurnal.radisi.or.id/index.php/JournalETANIC/article/view/256.