Ishak, Amal Hayati, Muhamad Rahimi Osman, Siti Khadijah Ab. Manan, and Rafeah Saidon. 2016. “Rasch Model Scale Calibration Analysis for Islamic Value”. International Review of Management and Marketing 6 (7S):11-16. https://econjournals.org.tr/index.php/irmm/article/view/3164.