Al-Awadhi, A. M., A. Bash, A. F. Al-Mutairi, and A. M. Al-Awadhi. “Returns of Islamic Stocks in Saudi Arabia: Segmentation and Risk-Aversion”. International Journal of Economics and Financial Issues, vol. 8, no. 2, Mar. 2018, pp. 238-42, https://www.econjournals.com/index.php/ijefi/article/view/5974.