1.
Putri Anzeli Simangunsong, Christina N Saragi, Kammer Sipayung. Politeness strategy used by President Barack Obama speech. Onoma [Internet]. 2024 Apr. 17 [cited 2025 Jul. 8];10(2):1542-8. Available from: https://www.e-journal.my.id/onoma/article/view/3502