Integrated Taxonomic Information System (ITIS): Otus koepckeae (TSN 555390)itis.gov. Viitattu 25.9.2011. (englanniksi)
iucnredlist.org
BirdLife International: Megascops koepckeaeIUCN Red List of Threatened Species. Version 2013.2. 2012. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 17.5.2014. (englanniksi)