Rokoszewska, Katarzyna. “Intra-Individual Variability in the Emergence of Lexical Complexity in Speaking English at Secondary School”. Theory and Practice of Second Language Acquisition 6, no. 1 (June 8, 2020): 107-142. Accessed July 13, 2024. https://www.journals.us.edu.pl/index.php/TAPSLA/article/view/7929.