Joseph Ewan, Jon Fjeldsa et Niels Krabbe, « Birds of the High Andes: A Manual to the Birds of the Temperate Zone of the Andes and Patagonia, South America », Taxon, vol. 40, no 4, , p. 700 (ISSN0040-0262, DOI10.2307/1222800, lire en ligne, consulté le )
Joseph Ewan, Jon Fjeldsa et Niels Krabbe, « Birds of the High Andes: A Manual to the Birds of the Temperate Zone of the Andes and Patagonia, South America », Taxon, vol. 40, no 4, , p. 700 (ISSN0040-0262, DOI10.2307/1222800, lire en ligne, consulté le )
Weir, D., Hanson, A. (1989), Food habits of great horned owls (Bubo virginianus) in the Northern Taiga of the Yukon Territory and Alaska. Can. Field Nat. 103, 12–17 résumé
