Hasri, Hudzaifah, et al. “COVID-19 Confirmed Cases Forecasting in Malaysia Using Linear Regression and Holt’s Winter Algorithm”. International Journal of Integrated Engineering, vol. 15, no. 3, July 2023, pp. 64-72, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/12818.