Foltýnek, Tomáš. “A NEW APPROACH TO THE ACHIEVEMENT TEST ITEMS EVALUATION: THE CORRECTNESS COEFFICIENT”. Journal on Efficiency and Responsibility in Education and Science 2, no. 1 (June 30, 2009): 28–40. Accessed April 24, 2024. https://www.eriesjournal.com/index.php/eries/article/view/13.