The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- David, Normand, and Michel Gosselin. 2002. The grammatical gender of avian genera. Bulletin of the British Ornithologists' Club, vol. 122, no. 4. 257-282
- R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York
- WoRMS (2013). Pygoscelis Wagler, 1832. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=225747