del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
Dutson, G.; Allen, D.; Brooks, T. 1996. Tawi-Tawi - extreme Philippine birding. Bulletin of the British Ornithologists' Club 24: 32-35.
Rasmussen, P.C., Allen, D.N.S., Collar, N.J., DeMeulemeester, B., Hutchinson, R.O., Jakosalem, P.G., Kennedy, R.S., Lambert, F.R. and Paguntalan, L.M. 2012. Vocal divergence and new species in the Philippine Hawk Owl Ninox philippensis complex. Forktail 28: 1-20.
Sibley, C.G. and Monroe, B.L. 1990. Distribution and Taxonomy of Birds of the World. Yale University Press, New Haven, USA.
Sibley, C.G. and Monroe, B.L. 1993. A supplement to 'Distribution and Taxonomy of Birds of the World'. Yale University Press, New Haven, USA.
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Recommended citation
BirdLife International (2024) Species factsheet: Sulu Boobook Ninox reyi. Downloaded from
https://datazone.birdlife.org/species/factsheet/sulu-boobook-ninox-reyi on 19/12/2024.
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 19/12/2024.