Pfenninger, Simone E. “Not so Individual After All: An Ecological Approach to Age As an Individual Difference Variable in a Classroom”. Studies in Second Language Learning and Teaching 7, no. 1 (March 31, 2017): 19–46. Accessed May 5, 2024. https://pressto.amu.edu.pl/index.php/ssllt/article/view/7443.