Dibdyaningsih , Haris, and Hendra Sudarso. “An Error Analysis of Using Auxiliary Verb in Islamic Mathematical Complex Questions Made by Mathematics Department Students ”. SELL (Scope of English Language Teaching, Linguistics, and Literature) Journal 4, no. 1 (January 28, 2020): 1–10. Accessed May 6, 2025. http://publikasi.stkippgri-bkl.ac.id/index.php/SL/article/view/211.