2011. Bioko Biodiversity Protection Program. Bioko Biodiversity Protection Program: http://www.bioko.org/index.php.
Collar, N. J.; Stuart, S. N. 1985. Threatened birds of Africa and related islands: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, and International Union for Conservation of Nature and Natural Resources, Cambridge, U.K.
Pérez del Val, J. 1996. Las aves de Bioko, Guinea Ecuatorial: guía de campo. Edilesa, Leon.
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Recommended citation
BirdLife International (2024) Species factsheet: Bioko Speirops Zosterops brunneus. Downloaded from
https://datazone.birdlife.org/species/factsheet/bioko-speirops-zosterops-brunneus on 22/12/2024.
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 22/12/2024.