Gozbasi, O., B. Altinoz, and E. E. Sahin. “Is Bitcoin a Safe Haven? A Study on the Factors That Affect Bitcoin Prices”. International Journal of Economics and Financial Issues, vol. 11, no. 4, July 2021, pp. 35-40, https://www.econjournals.com/index.php/ijefi/article/view/11602.