Geographical distribution of Sooty grouse.
BirdLife International. 2016. Dendragapus fuliginosus. The IUCN Red List of Threatened Species 2016: e.T22734695A95095286. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22734695A95095286.en. Downloaded on 27 June 2018.
Cephas