Hidayat, A. S. E., and G. Primajati. “Estimating and Forecasting Jakarta Composite Index in Pandemic Era Using ARIMA-GARCH Model”. Jurnal Varian, Vol. 7, no. 2, June 2024, pp. 115 -26, doi:https://doi.org/10.30812/varian.v7i2.2103.