Hafsa Tazeen, Shumaila Aman, and Dr. Muhammad Asif. “Investigation of the Relationship of Receptive Vocabulary Size and Speaking Skills: A Study of IELTS Test Takers in Pakistan”. International "Journal of Academic Research for Humanities" 3, no. 1 (March 31, 2023): 127–137. Accessed June 14, 2025. https://jar.bwo-researches.com/index.php/jarh/article/view/159.