References

Animals, a visual encyclopedia. Smithsonian. 2012. Pp. 204-209.

World of animals. Magazine. Imagine publishing, 2014. Pp. 64-70.

World of animals. Book of predators. Imagine publishing, 2014. Pp. 114-123.

Enciclopedia del mundo animal. Parragon, 2013. Pp.158-165, 172.

Hamlett, William C. Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes. JHU Press, 1999.

http://www.sharksavers.org/en/home/

http://www.nmfs.noaa.gov/stories/2012/08/08_13_12new_shark_week_splash_page.html

http://news.nationalgeographic.com/news/2014/01/140129-whale-shark-endangered-cites-ocean-animals-conservation/

http://animaldiversity.org

http://www.arkive.org

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