Tw, Afrizal. “Adjusting the Concept of the Validity of Worship in the Terminology of the Ushuliyyin”. Journal of Islamic Sciences 5, no. 3 (June 30, 2022): 101–124. Accessed December 19, 2025. https://www.ajsrp.ojsexpert.com/index.php/jis/article/view/5239.