Halil, Nur Ihsan, Takwa, and Musliha. 2021. “Implementation of Linguistic Politeness Throughout Online Lectures via WhatsApp During the Covid-19 Pandemic”. Jurnal Penelitian Dan Pengkajian Ilmu Pendidikan: E-Saintika 5 (3): 195-211. https://doi.org/10.36312/esaintika.v5i3.484.