References

Momatiuk, Eastcott. Face to face with penguins. National Geographic, 2009.

Lynch, Wayne. Penguins of the world. Firefly Books, 2007.

Salomon, David. Penguin-pedia. Brown Books Publishing Group, 2011.

Spencer Davis, Lloyd. Questions and Answers. Penguins. Smithsonian-Collins, 2007.

Simon, Seymour. Penguins. Smithsonian-Collins, 2007.

Alderton, David. The encyclopedia of animals. Chartwell books, Inc., 2009. Pág. 400.

Christiansen, Per. The encyclopedia of birds. Chartwell books, Inc., 2013. Pp. 404-408.

Curtsinger, Bill. Naturaleza al extremo. Numen, 2005.

http://seaworld.org/en/animal-info/animal-infobooks/penguin/

http://en.wikipedia.org/wiki/Penguin

http://www.penguins.org.au/