Pei, Zhengwei, and Kerong Qin. “The Younger, the Better? A Multi-Factorial Approach to Understanding Age Effects on EFL Phonological Attainment”. Journal of Language and Education 5, no. 1 (March 31, 2019): 29-48. Accessed April 19, 2024. https://jle.hse.ru/article/view/8562.