Sumiyana, S. (2007) “Behavior of Stock Price Variability over Trading and Nontrading Periods, and Daily Return Volatility”, Gadjah Mada International Journal of Business, 9(3), hlm. 409-453. Tersedia pada: https://journal.ugm.ac.id/v3/gamaijb/article/view/14937 (Diakses: 3April2025).