Azizah, Alfi, Suparno, and Slamet Supriyadi. 2022. “Reasons Behind Students’ Silence to Teacher’s Directive Utterances: A Case Study on A Lower Secondary School in Yogyakarta”. NOBEL: Journal of Literature and Language Teaching 13 (2):254-70. https://doi.org/10.15642/NOBEL.2022.13.2.254-270.