Orhan, Z. H., ve N. Tırman. “Analysis of the Impact of Covid-19 on Different Sectors in Turkey During Early Periods of the Pandemic”. İşletme Araştırmaları Dergisi, c. 12, sy 3, Haziran 2021, ss. 2312-26, https://isarder.org/index.php/isarder/article/view/1151.