- ↑ 1.0 1.1
"Procellaria cinerea". IUCN Red List of Threatened Species. Version 2012.2. International Union for Conservation of Nature. 2012. Ginkuhà 24 Oktubre 2012.
- ↑ (1996) , database, NODC Taxonomic Code
- ↑ Mayr, Ernst, and G. William Cottrell, eds. (1979) , Check-List of Birds of the World, vol. 1, Second Edition
- ↑ American Ornithologists' Union (1983) , Check-list of North American Birds, 6th Edition
- ↑ American Ornithologists' Union (1957) , Check-list of North American Birds, 5th Edition
- ↑ Gill, Frank, and Minturn Wright (2006) , Birds of the World: Recommended English Names
- ↑ (2007) , website, Zoonomen - Zoological Nomenclature Resource, 2007.04.20
- ↑ 8.0 8.1 Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (ed.) (2011). "Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 24 Septyembre 2012.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- ↑ ITIS: The Integrated Taxonomic Information System. Orrell T. (custodian), 26 Abril 2011
