Mat Nor, N., S. H. Mohd Zaid, M. M. J. Shamsuddin, and M. A. Jamaludin. “Analysis Of Allantoin Sources From Shariah Perspective In Cosmetic Product: Analisis Hukum Ramuan Allantoin Dalam Produk Kosmetik”. Al-Qanatir: International Journal of Islamic Studies, vol. 15, no. 1, June 2019, pp. 23-37, https://al-qanatir.com/aq/article/view/213.