Ferguson-Lees, James; David A. Christie. Raptors of the World. London: Christopher Helm, an imprint of A&C Black Publishers Ltd. 2001: 320. ISBN 0713669578(英语).引文使用过时参数coauthors (帮助)
(英文) Remsen, J. V., Jr.; C. D. Cadena; A. Jaramillo; M. Nores; J. F. Pacheco; M. B. Robbins; T. S. Schulenberg; F. G. Stiles; D. F. Stotz & K. J. Zimmer. 2007. A classification of the bird species of South America. (页面存档备份,存于互联网档案馆) South American Classification Committee.
metapress.com
royalsociety.metapress.com
(英文) Ericson, Per G. P.; Anderson, Cajsa L.; Britton, Tom; Elżanowski, Andrzej; Johansson, Ulf S.; Kallersjö, Mari; Ohlson, Jan I.; Parsons, Thomas J.; Zuccon, Dario & Mayr, Gerald (2006): Diversification of Neoaves: integration of molecular sequence data and fossils. Biology Letters online: 1-5. doi:10.1098/rsbl.2006.0523Electronic Supplementary MaterialArchive-It的存檔,存档日期2009-02-25 (PDF)
Milleson, Michael P.; Stephanie P. Shwiff and Michael L. Avery. Vulture-Cattle Interactions – A Survey of Florida Ranchers(PDF). Proceedings, 22nd Vertebrate Pest Conference. University of California, Davis. 2006 [2007-12-09]. (原始内容(PDF)存档于2015-12-10).引文使用过时参数coauthors (帮助)
(英文) Remsen, J. V., Jr.; C. D. Cadena; A. Jaramillo; M. Nores; J. F. Pacheco; M. B. Robbins; T. S. Schulenberg; F. G. Stiles; D. F. Stotz & K. J. Zimmer. 2007. A classification of the bird species of South America. (页面存档备份,存于互联网档案馆) South American Classification Committee.
Milleson, Michael P.; Stephanie P. Shwiff and Michael L. Avery. Vulture-Cattle Interactions – A Survey of Florida Ranchers(PDF). Proceedings, 22nd Vertebrate Pest Conference. University of California, Davis. 2006 [2007-12-09]. (原始内容(PDF)存档于2015-12-10).引文使用过时参数coauthors (帮助)