Geographical distribution of Harlequin duck.   Breeding  Nonbreeding
BirdLife International. 2016. Histrionicus histrionicus. The IUCN Red List of Threatened Species 2016: e.T22680423A85993924. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22680423A85993924.en. Downloaded on 29 June 2018.
Cephas