Integrated Taxonomic Information System (ITIS): Otus manadensis (TSN 555370)itis.gov. Viitattu 27.9.2011. (englanniksi)
iucnredlist.org
BirdLife International: Otus manadensisIUCN Red List of Threatened Species. Version 2014.3. 2014. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 22.2.2015. (englanniksi)