الإتاحة: http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-23434Test
الإتاحة: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-21852Test
الإتاحة: http://www.teses.usp.br/teses/disponiveis/5/5153/tde-20052016-160232Test/
الإتاحة: http://repositorio.bc.ufg.br/tede/handle/tde/1481Test
الإتاحة: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-7910Test
الإتاحة: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337352142Test