Hamadneh, I. . ., and W. . . Al-Shurman. “The Differences in Item Difficulty Parameter Estimations for Simulated Data Having (MC1- PL) Model in Item Response Theory”. Tishreen University Journal- Arts and Humanities Sciences Series, vol. 37, no. 6, Sept. 2016, https://journal.tishreen.edu.sy/index.php/humlitr/article/view/2000.