References

Enciclopedia del mundo animal. Parragon, 2013. Pp. 23, 58, 59.

Sale, Richard. The Arctic. The complete story. Frances Lincoln Limited Publishers, 2008. Pp. 489-501.

Curtsinger, Bill. Naturaleza al extremo. Numen, 2005. Pp. 204-229.

Alderton, David. The encyclopedia of animals. Chartwell books, Inc., 2009. Pp. 185, 187, 188, 190.

World of animals Magazine. Imagine publishing. Pp. 20, 21.

Animals, a visual encyclopedia. Smithsonian. 2012. Pp. 52-59.

http://species-identification.org/index.php?groep=Whales&selectie=51&hoofdgroepen_pad=%2C1%2C11%2C51

http://www.profepa.gob.mx/innovaportal/v/429/1/mx/especies_marinas_protegidas.html

http://www.savethewhales.org/

http://www.worldwildlife.org/species/whale

http://www.greenpeace.org/international/en/campaigns/oceans/fit-for-the-future/whaling/

http://iwc.int/whaling