الوصول الحر: https://www.jstor.org/stable/24092993Test
الإتاحة: http://www.dtic.mil/docs/citations/AD0716374Testhttp://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0716374Test
الإتاحة: http://www.dtic.mil/docs/citations/AD0701050Testhttp://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0701050Test