Mustapa, Farah Hayati, and Mohd Tahir Ismail. 2026. “Regime-Adaptive ARIMA–GARCH Framework under Structural Break: Evidence from the S&P 500 Index”. Journal of Applied Science, Engineering, Technology, and Education 8 (2). Takalar, Indonesia:480-91. https://doi.org/10.35877/454RI.asci4894.