Clincy, Miriam, Karin Melzer, Gunther Schaaf, Achim Eichhorn, and Nathalie Verné. “Inside the ‘Sandbox’: The Effects of Unlimited Practice for Summative Online-Tests”. International Journal of Emerging Technologies in Learning (iJET) 17, no. 23 (December 8, 2022): pp. 115–127. Accessed May 4, 2024. https://online-journals.org/index.php/i-jet/article/view/35939.