Refining and Validating Paul Nation’sVocabulary Size Test for TOEFL Candidates inPakistan: An Item Discrimination and Predictive Validity Studyvocabulary size test. LinFo [Internet]. 2025 Dec. 6 [cited 2026 Jul. 22];7(2):1-30. Available from: https://www.linguisticforum.com/index.php/ling/article/view/281