The Canadian Shield. Unknown (2012). ttps://www.google.ca/search?q=canadian+shield&source
Retrieved from Google images.
Canadian Shield Foundation. (2013). Understanding The Canadian Shield : It's Geology; It's Ecology
Retrieved from http://www.canadianshieldfoundation.ca/
J. Bastedo.The Canadian Encyclopedia. (2012). The encyclopedia on Canada
Retrieved from http://www.thecanadianencyclopedia.com/articles/shield
Retrieved from Google images.
Canadian Shield Foundation. (2013). Understanding The Canadian Shield : It's Geology; It's Ecology
Retrieved from http://www.canadianshieldfoundation.ca/
J. Bastedo.The Canadian Encyclopedia. (2012). The encyclopedia on Canada
Retrieved from http://www.thecanadianencyclopedia.com/articles/shield