Zhou, Hanru, and Qinglan Yu. “The Study of Opening and Closing of Conversations in Oral English Textbooks”. Journal of English Language Teaching and Applied Linguistics 5, no. 2 (June 1, 2023): 183–190. Accessed June 8, 2025. https://al-kindipublishers.org/index.php/jeltal/article/view/5361.