Lerner, H. R. L.; Mindell, D. P. (). „Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA”. Molecular Phylogenetics and Evolution. 37 (2): 327–346. Bibcode:2005MolPE..37..327L. doi:10.1016/j.ympev.2005.04.010. PMID15925523.
fws.gov
Office of Law Enforcement. „National Eagle Repository”. Mountain-Prairie Region. United States Fish and Wildlife Service. Arhivat din original la . Accesat în .
Lerner, H. R. L.; Mindell, D. P. (). „Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA”. Molecular Phylogenetics and Evolution. 37 (2): 327–346. Bibcode:2005MolPE..37..327L. doi:10.1016/j.ympev.2005.04.010. PMID15925523.
newadvent.org
Fonck, L. (1910). St. John the Evangelist. In The Catholic Encyclopedia (New York: Robert Appleton Company). Retrieved 14 August 2017 from New Advent.
Lerner, H. R. L.; Mindell, D. P. (). „Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA”. Molecular Phylogenetics and Evolution. 37 (2): 327–346. Bibcode:2005MolPE..37..327L. doi:10.1016/j.ympev.2005.04.010. PMID15925523.
Office of Law Enforcement. „National Eagle Repository”. Mountain-Prairie Region. United States Fish and Wildlife Service. Arhivat din original la . Accesat în .