Urban, E. K.; Fry, C. H.; Keith, S. (1986). The Birds of Africa, Volume II. <em>Academic Press, London.</em>
Woehler E.J. (compiler) 2006. Species list prepared for SCAR/IUCN/BirdLife International Workshop on Antarctic Regional Seabird Populations, March 2005, Cambridge, UK. (look up in IMIS)