Knud A Jønsson, Pierre-Henri Fabre, Martin Irestedt. Brains, tools, innovation and biogeography in crows and ravens. „BMC Evol Biol.”. 12, s. 72, 2012. DOI: 10.1186/1471-2148-12-72. PMCID: PMC3480872. (ang.).
Corvus violaceus, [w:] Integrated Taxonomic Information System(ang.).
iucnredlist.org
apiv3.iucnredlist.org
Corvus violaceus, [w:] The IUCN Red List of Threatened Species(ang.).
nih.gov
ncbi.nlm.nih.gov
Knud A Jønsson, Pierre-Henri Fabre, Martin Irestedt. Brains, tools, innovation and biogeography in crows and ravens. „BMC Evol Biol.”. 12, s. 72, 2012. DOI: 10.1186/1471-2148-12-72. PMCID: PMC3480872. (ang.).