Integrated Taxonomic Information System (ITIS): Tockus camurus (TSN 554404)itis.gov. Viitattu 13.3.2017. (englanniksi)
iucnredlist.org
BirdLife International: Lophoceros camurusIUCN Red List of Threatened Species. Version 3.1. 2016. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 13.3.2017. (englanniksi)