Ahmad, Noorsiah, and Sariwati Mohd. Shariff. “Halal Cleansing Operations towards Halal Integrity: A Literary Insight”. Selangor Business Review, vol. 2, no. 1, Dec. 2017, pp. 35-48, https://sbr.journals.unisel.edu.my/index.php/sbr/article/view/13.