Matouk, A. E. M. „The Development of the World Trade and Strengthening of Protectionism in the World Economy in the 1980-90-S”. Marketing &Amp; Menedzsment, köt. 33, sz. 1, 2019. december, o. 52-56, https://journals.lib.pte.hu/index.php/mm/article/view/1997.