↑ BirdLife International (2004). Ichthyophaga ichthyaetus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Database entry includes a brief justification of why this species is near threatened
↑ Ferguson-Lees, James (2005). Raptors of the World: A Field Guide (Helm Field Guides). Christopher Helm Publishers Ltd. ISBN0713669578. Unknown parameter |coauthors= ignored (|author= suggested) (help)
