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Tài liệu tham khảo WikiPedia: Vịt Elizabeth http://www.roysfarm.com/elizabeth-duck/ http://www.seqwa.net/duckbreeds.htm http://www.rarebreeds.co.nz/ducks.html http://www.rbta.org/Pdf%20Files/Status%20of%20Rare... https://web.archive.org/web/20140411150512/http://... https://web.archive.org/web/20141222014207/http://... https://books.google.com.ph/books?id=C_TaHnw5O8QC&...
