Literature
- AviBase 2017. AviBase - the world bird database. [link]
Literature references linked to higher taxa
- eBird: An online database of bird distribution and abundance. eBird, Ithaca, New York. [link] (Aves)
- AviList Core Team 2025. AviList: the global avian checklist, v2025. [link] (Cathartiformes)