Ruhulessin, Vonny. “Analyzing The Content of Senior High School Textbooks Towards SLA-Based Principles”. MATAI: International Journal of Language Education 1, no. 2 (June 20, 2021): 94-106. Accessed July 28, 2024. https://ojs3.unpatti.ac.id/index.php/matail/article/view/4353.