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Hatch, Jeremy J.; Brown, Kevin M.; Hogan, Geoffrey G.; Morris, Ralph D. (2000). «Great Cormorant (Phalacrocorax carbo)». En Poole, A., ed. The Birds of North America Online. Ithaca: Cornell Lab of Ornithology. doi:10.2173/bna.553.
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«European Parliament resolution». 4 de diciembre de 2008. «on the adoption of a European Cormorant Management Plan to minimise the increasing impact of cormorants on fish stocks, fishing and aquaculture».