Arip, M. A. S. M., S. M. Jais, A. Benu, M. S. Zakaria, N. H. Zahariman, and N. Ishak. “Construction, Validity and Reliability of the Inventory of Basic Religious Knowledge (IBRK)”. Asian Journal of Assessment in Teaching and Learning, vol. 2, Dec. 2012, pp. 86-94, https://ojs.upsi.edu.my/index.php/AJATeL/article/view/1927.