Integrated Taxonomic Information System (ITIS): Ketupa flavipes (TSN 555420)itis.gov. Viitattu 16.7.2012. (englanniksi)
iucnredlist.org
BirdLife International: Ketupa flavipesIUCN Red List of Threatened Species. Version 2013.2. 2012. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 17.5.2014. (englanniksi)