Zhao, Hongyu. “Did COVID-19 Exacerbate the ‘Day-of-the-Week Effect’ in the Nasdaq, S&P 500, and Russell 2000 Stock Markets?”. Journal of Theory and Practice in Humanities and Social Sciences, vol. 1, no. 4, Sept. 2024, pp. 33-40, https://woodyinternational.com/index.php/jtphss/article/view/54.