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2. First evidence of DNA sequence differences between Northern Bald ibises (Geronticus eremita) of Moroccan and Turkish origin;Pegoraro;Journal für Ornithologie,2001
3. Northern Bald ibis.;Hirsch;Study West Palearctic Birds,1979
4. Notes on the extinct population of the northern bald ibis(Geronticus eremita) in the Syrian Desert;Safriel;Ibis,1980
5. Der Waldrapp (Geronticus eremita), ein Beitragzur Situation in seinemostlichenVerbreitungsgebiet.;Hirsch;Vogelwelt,1980