et. al., G. N. A. . “The Impacts Of Covid-19 To Saudi Arabia’s Economic Sector And Hajj Pilgrimage Policy Of The Kingdom Of Saudi Arabia”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 8, Apr. 2021, pp. 463-72, https://turcomat.org/index.php/turkbilmat/article/view/2823.