Manlius, Nicolas; Menardi-Noguera, Alessandro; Zboray, Andras (2003). "Decline of the Barbary sheep (Ammotragus lervia) in Egypt during the 20th century: literature review and recent observations". Journal of Zoology. 259 (4): 403–409. doi:10.1017/S0952836902003394.
Acevedo, Pelayo; Cassinello, Jorge; Hortal, Joaquín; Gortázar, Christian (1 June 2007). "Invasive exotic aoudad (Ammotragus lervia) as a major threat to native Iberian ibex (Capra pyrenaica): a habitat suitability model approach". Diversity and Distributions. 13 (5): 587–597. Bibcode:2007DivDi..13..587A. doi:10.1111/j.1472-4642.2007.00374.x. hdl:10261/118202. S2CID83656269.
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Wacher, T., El Din, S. B., Mikhail, G., & El Din, M. B. (2002). New observations of the ‘extinct’ Barbary sheep Ammotragus lervia ornata in Egypt. Oryx, 36(3), 301-304. doi:10.1017/S0030605302000534
Manlius, N., Menardi-Noguera, A. and Zboray, A. 2003. Decline of the Barbary sheep (Ammotragus lervia) in Egypt during the 20th century: literature review and recent observations. Journal of Zoology (London) 259: 403-409. doi:10.1017/S0952836902003394
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Acevedo, Pelayo; Cassinello, Jorge; Hortal, Joaquín; Gortázar, Christian (1 June 2007). "Invasive exotic aoudad (Ammotragus lervia) as a major threat to native Iberian ibex (Capra pyrenaica): a habitat suitability model approach". Diversity and Distributions. 13 (5): 587–597. Bibcode:2007DivDi..13..587A. doi:10.1111/j.1472-4642.2007.00374.x. hdl:10261/118202. S2CID83656269.
Acevedo, Pelayo; Cassinello, Jorge; Hortal, Joaquín; Gortázar, Christian (1 June 2007). "Invasive exotic aoudad (Ammotragus lervia) as a major threat to native Iberian ibex (Capra pyrenaica): a habitat suitability model approach". Diversity and Distributions. 13 (5): 587–597. Bibcode:2007DivDi..13..587A. doi:10.1111/j.1472-4642.2007.00374.x. hdl:10261/118202. S2CID83656269.
Acevedo, Pelayo; Cassinello, Jorge; Hortal, Joaquín; Gortázar, Christian (1 June 2007). "Invasive exotic aoudad (Ammotragus lervia) as a major threat to native Iberian ibex (Capra pyrenaica): a habitat suitability model approach". Diversity and Distributions. 13 (5): 587–597. Bibcode:2007DivDi..13..587A. doi:10.1111/j.1472-4642.2007.00374.x. hdl:10261/118202. S2CID83656269.