S. A. Hassan, M. D. A. M. Ahmaday, and M. A. Khamis, “The nature of the political system of Germany and their effect on foreign policy (The Syrian refugees as a model from 2011–2019)”, JHSS, vol. 4, no. 11, pp. 149–137, Nov. 2020, doi: 10.26389/AJSRP.C210620.