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WikiPedia: Vịt_mắt_vàng_thường http://www.enature.com/fieldguides/detail.asp?allS... http://www.ornithos.de/Ornithos/Feather_Collection... http://www.birds.cornell.edu/AllAboutBirds/BirdGui... http://www.birds.cornell.edu/clementschecklist/dow... http://www.mbr-pwrc.usgs.gov/id/framlst/i1510id.ht... http://www.iucnredlist.org/details/22680455/0 http://www.nature-pictures.org/foto/64/ https://web.archive.org/web/20070929083713/http://... https://web.archive.org/web/20180304042403/http://... https://commons.wikimedia.org/wiki/Category:Buceph...