Ridgely, R. S., T. F. Allnutt, T. Brooks, D. K. McNicol, D. W. Mehlman, B. E. Young, and J. R. Zook. 2005. Digital Distribution Maps of the Birds of the Western Hemisphere, version 2.1. NatureServe, Arlington, Virginia, USA. Additional updates and changes by BirdPhotos.com 2016.
Sweden,Czech Republic,Latvia,Turkey,Croatia,United Kingdom,Slovenia,Serbia,Bulgaria,Belarus,Netherlands,Ukraine,Romania,Greece,Germany,Belgium,France,Hungary,Liechtenstein,Estonia,Ireland,Bosnia and Herzegovina,Iceland,Slovakia,Poland,Spain,Switzerland,Lithuania,Norway,Canada,Luxembourg,Russia,Finland,Austria,Greenland,Denmark,Albania,United States - Alaska,United States - mainland,Montenegro,