Sapoetra, Jimmy. “Face Threatening Acts in Pre-Service Teachers and Students: A Case Study in EFL Classroom”. Biormatika : Jurnal ilmiah fakultas keguruan dan ilmu pendidikan 7, no. 2 (September 30, 2021): 199–205. Accessed March 28, 2024. https://ejournal.unsub.ac.id/index.php/FKIP/article/view/1104.