M. Usman, M. Y. Wardhana, and M. Istiqamah, “Analysis of the Risk of Rubber Prices Using the ARCH-GARCH and VaR Methods on Farm Income in West Aceh District”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 12, no. 3, pp. 1018–1022, Jun. 2022.