1. Behaviour of the Pomarine Skua Stercorarius pomarinus Temm.;Andersson;with comparative remarks on Stercorariinae. Ornis Scandinavica,1973
2. Phylogeny, behaviour, plumage evolution and neoteny in skuas Stercorariidae.;Andersson;Journal of Avian Biology,1999
3. The Cuban Martin in Florida.;Banks;Florida Field Naturalist,2000
4. Birds of the Niagara Frontier Region.;Beardslee;Bulletin of the Buffalo Society of Natural Science,1965
5. The magpies.;Birkhead,1991