Roessingh, Hetty, and Pat Kover. “Variability of ESL Learners’ Acquisition of Cognitive Academic Language Proficiency: What Can We Learn From Achievement Measures?”. TESL Canada Journal 21, no. 1 (October 30, 2003): 1–21. Accessed May 10, 2024. https://teslcanadajournal.ca/index.php/tesl/article/view/271.