Chú thích Thiên_nga_lớn

  1. ↑ BirdLife International (2004). Cygnus cygnus. Sách đỏ 2006. IUCN 2006. Truy cập ngày 9 tháng 5 năm 2006. Database entry includes justification for why this species is of least concern
  2. ↑ Brazil, Mark, The Whooper Swan. Christopher Helm Ornithology (2003), ISBN 978-0-7136-6570-3
  3. ↑ CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.
  4. ↑ Madge, Steve, Waterfowl: An Identification Guide to the Ducks, Geese, and Swans of the World. Houghton Mifflin Harcourt (1992), ISBN 978-0-395-46726-8
  5. ↑ Mondadori, Arnoldo biên tập (1988). Great Book of the Animal Kingdom. New York: Arch Cape Press. tr. 183.
  6. ↑ “Bird flu swan was from outside UK”. BBC News. ngày 11 tháng 4 năm 2006.

Tài liệu tham khảo

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