Literature
  • , Steventon 1971
  • Iceland bird report for 1970. Brathay Exploration Group Field Studies Report 12: 24-25
  • Gudmundsson 1954
  • Iceland's birds (9) The Great Skua. Natturufraedingurinn 24: 123-136
  • Velando, Freire 1999
  • Intercolony and seasonal differences in the breeding diet of European shags on the Galician coast (NW Spain). Mar. Ecol. Prog. Ser. 188: 225-236
  • 1980
  • Investigation of the Distribution of Seabirds at Sea. Nature Conservancy Council, Edinburgh 88pp