Collar, N. J.; Mallari, N. A. D.; Tabaranza, B. R. J. 1999. Threatened birds of the Philippines: the Haribon Foundation/BirdLife International Red Data Book. Bookmark, Makati City.
Meier, G.G. 2004. Grey imperial pigeon: a new record from East Kalimantan, Indonesia. Birding Asia 1: 56-67.
Melville, D. S. 1997. Call of the Grey Imperial Pigeon. Kukila: 172.
Riley, J. 2003. Population sizes and the conservation status of endemic and restricted-range bird species on Karakelang, Talaud Islands, Indonesia. Bird Conservation International 13: 59-74.
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Recommended citation
BirdLife International (2024) Species factsheet: Grey Imperial-pigeon Ducula pickeringii. Downloaded from
https://datazone.birdlife.org/species/factsheet/grey-imperial-pigeon-ducula-pickeringii 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.