Yusof, Fatin Ariana, et al. “Penggunaan Normal Ratio Method Untuk Mencari Missing Data Di Empangan Air Machap”. Multidisciplinary Applied Research and Innovation, vol. 4, no. 3, May 2023, pp. 70-76, https://publisher.uthm.edu.my/periodicals/index.php/mari/article/view/8454.