Thi Oanh, Nguyen. “Intralingual Interferences on Examples of Morphosyntactic Errors of Vietnamese Learners of German at Level B1”. Journal of Letters 47, no. 3 (December 29, 2018): 229–252. Accessed May 6, 2024. https://so03.tci-thaijo.org/index.php/jletters/article/view/158844.