https://www.mnh.si.edu/arctic/html/resources_faq.htmlhttp://www.cotf.edu/ete/modules/msese/earthsysflr/tundraP.html
http://www.infoplease.com/encyclopedia/world/arctic-the-natural-resources.html
http://arctic.ru/natural-resources
Warhol, Tom. Tundra. New York: Marshall Cavendish Benchmark, 2007. Print.
Shepherd, Donna Walsh. Tundra. New York: F. Watts, 1996. Print.
Lynch, Wayne. Planet Arctic: life at the top of the world. New York: Firefly Books, Inc. 2010. Print.
http://www.infoplease.com/encyclopedia/world/arctic-the-natural-resources.html
http://arctic.ru/natural-resources
Warhol, Tom. Tundra. New York: Marshall Cavendish Benchmark, 2007. Print.
Shepherd, Donna Walsh. Tundra. New York: F. Watts, 1996. Print.
Lynch, Wayne. Planet Arctic: life at the top of the world. New York: Firefly Books, Inc. 2010. Print.