الإتاحة: https://doi.org/10.17863/CAM.58342Testhttps://www.repository.cam.ac.uk/handle/1810/311251Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=od_______109::7668a0e830a206f3bc1b7f362871e770Testhttps://www.repository.cam.ac.uk/handle/1810/311251Test
الإتاحة: https://doi.org/10.1002/9781119000822.hfcm022.pub2Test
الإتاحة: https://doi.org/10.1207/s15328015tlm1303_8Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::19baeb9127c0cb462928c85324953c30Test