Adhitama J, Rahmani D. The merits on using COVID-19 theme material in WhatsApp-based online learning for teaching announcement text. pengembangan masyarakat [Internet]. 2021Sep.20 [cited 2024Dec.5];1(1):250-2. Available from: https://proceeding.mbunivpress.or.id/index.php/bamara/article/view/302