Fry, C.H.; Keith, S.; Urban, E.K. 2000. The birds of Africa Vol. VI. Academic Press, London.
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Recommended citation
BirdLife International (2024) Species factsheet: Black-capped Speirops Zosterops lugubris. Downloaded from
https://datazone.birdlife.org/species/factsheet/black-capped-speirops-zosterops-lugubris on 23/12/2024.
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 23/12/2024.