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Tài liệu tham khảo WikiPedia: Vịt đầu đỏ http://www.birds.cornell.edu/clementschecklist/dow... http://www.eu-nomen.eu/portal/taxon.php?GUID=urn:l... http://datazone.birdlife.org/species/factsheet/226... http://fossilworks.org/bridge.pl?a=taxonInfo&taxon... http://www.irmng.org/aphia.php?p=taxdetails&id=105... http://www.iucnredlist.org/details/100600472/0 http://www.tierstimmen.org/en/database?field_spec_... https://www.hbw.com/species/common-pochard-aythya-... https://www.biolib.cz/en/taxon/id8469 https://catalogue.bnf.fr/ark:/12148/cb12369582x
