Case, Rod E, and Matthew Nall. “Negative Transfer Among Adult and L2 Proficiency: Breaking the Gridlock in the Research”. International Journal of English Language and Literature Studies 11, no. 1 (March 17, 2022): 57–70. Accessed April 24, 2024. https://archive.aessweb.com/index.php/5019/article/view/4446.