الوصول الحر: https://doaj.org/article/24d335b990934519bc8b2ce704e338cbTest
الإتاحة: https://doi.org/10.60692/qfvjx-h5x7410.60692/hyff9-sgm12Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a66e7921014af5a4efd96469814564c3Testhttp://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/229/425Test