Integrated Taxonomic Information System (ITIS): Ninox rufa (TSN 555475)itis.gov. Viitattu 8.8.2011. (englanniksi)
iucnredlist.org
BirdLife International: Ninox rufaIUCN Red List of Threatened Species. Version 2013.2. 2012. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 16.5.2014. (englanniksi)