North America. (2004, January 25). Retrieved April 20, 2018, from http://www.essayworld.com/essays/North-America/2013
"North America." Essayworld.com. Essayworld.com, 25 Jan. 2004. Web. 20 Apr. 2018. <http://www.essayworld.com/essays/North-America/2013>
"North America." Essayworld.com. January 25, 2004. Accessed April 20, 2018. http://www.essayworld.com/essays/North-America/2013.
"North America." Essayworld.com. January 25, 2004. Accessed April 20, 2018. http://www.essayworld.com/essays/North-America/2013.