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IUCN. 2021. The IUCN Red List of Threatened Species. Version 2021-3. Available at: https://www.iucnredlist.org. (Accessed: 09 December 2021).
Keith, S.; Urban, E.K.; Fry, C.H. 1992. The Birds of Africa Vol. IV. Academic Press, London.
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Recommended citation
BirdLife International (2024) Species factsheet: Grauer's Broadbill Pseudocalyptomena graueri. Downloaded from
https://datazone.birdlife.org/species/factsheet/grauers-broadbill-pseudocalyptomena-graueri on 22/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 22/11/2024.