Olson, S. L. 1975. Paleornithology of St Helena Island, South Atlantic Ocean. Smithsonian Contributions to Paleobiology 23: 1-49.
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BirdLife International (2023) Species factsheet: Bulweria bifax. Downloaded from http://www.birdlife.org on 24/03/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/03/2023.