Rio Rita, Maria, Sugeng Wahyudi, and Harjum Muharam. “Bad Friday, Monday Effect and Political Issue: Application of ARCH-GARCH Model to Analyze Seasonal Pattern of Stock Return”. International Journal of Engineering and Technology 7, no. 3.30 (August 24, 2018): 38–47. Accessed August 16, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/18152.