All About Birds: Northwest US and Canada

Cornell Lab of Ornithology

Birds of the Yukon Territory

Sinclair, Pamela H.; Johnson, Ingrid; Jensen, Marilyn; Hughes, Nancy L.; Nixon, Wendy A.; Eckert, Cameron D.; Doyle, Frank L.; Grunberg, Helmut; Mossop, David H.; Sinclair, Pamela H.

ABA Regional Checklist: Western Canada and Alaska