Barak, Başak, and Betül Barut. “Reframing the Reasoning Gap: Cognitive-Domain Achievement Profiles and Their Predictors Among Eighth-Grade Students in Türkiye Across TIMSS 2019 and 2023”. International Electronic Journal of Elementary Education, vol. 18, no. 5, Oct. 2026, pp. 801-13, https://www.iejee.com/index.php/IEJEE/article/view/2847.