https://www.cambridge.org/core/journals/studies-in-second-language-acquisition/article/abs/age-and-ultimate-attainment-in-the-pronunciation-of-a-foreignlanguage/6E23AD5210A8DE7AF3D10FA5F682403C
AGE AND ULTIMATE ATTAINMENT IN THE PRONUNCIATION OF A FOREIGNLANGUAGE | Studies in Second Language...
AGE AND ULTIMATE ATTAINMENT IN THE PRONUNCIATION OF A FOREIGNLANGUAGE - Volume 19 Issue 4
pronunciation of a