Integrated Taxonomic Information System (ITIS): Butastur teesa (TSN 175532)itis.gov. Viitattu 6.9.2013. (englanniksi)
iucnredlist.org
BirdLife International: Butastur teesaIUCN Red List of Threatened Species. Version 2013.2. 2012. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 8.5.2014. (englanniksi)