Tài liệu tham khảo WikiPedia: Quạ_Hawaii http://bna.birds.cornell.edu/bna/species/648/artic... http://www.iucnredlist.org/ http://www.iucnredlist.org/apps/redlist/details/14... http://www.state.hi.us/dlnr/dofaw/cwcs/files/NAAT%... https://web.archive.org/web/20120213181031/http://... https://species.wikimedia.org/wiki/Corvus_hawaiien...
