Agung, A., A. Zaqiyah, M. Rozikin, M. S. Wafa, and A. R. Nuha. “Implementation of A Contemporary Model Between Trading Volume, Bid-Ask Spreads, And Stock Return Volatility (Case Study : The Business-27 Index)”. JURNAL SINTAK, vol. 2, no. 2, Mar. 2024, pp. 60-65, doi:10.62375/jsintak.v2i2.223.