الوصول الحر: https://doaj.org/article/7f5c3fb4a77342788a9cf88ac0b54ab2Test
الوصول الحر: https://doaj.org/article/cd25f14d033d48ac9391413aa12d5e81Test
الإتاحة: https://dspace.library.uu.nl/handle/1874/450308Test
الإتاحة: https://dspace.library.uu.nl/handle/1874/444396Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0bc66a05c940d17ae2e4453be6892bb1Test
URL: https://studenttheses.uu.nl/handle/20.500.12932/43318Test
URL: https://studenttheses.uu.nl/handle/20.500.12932/43242Test