Douglass C. North received the 1993 Nobel Prize in Economics for his work applying economic theory and statistical methods to the study of history.
Douglass Cecil North. (2013). The Biography Channel website. Retrieved 03:20, May 25, 2013, from http://www.biography.com/people/douglass-c-north-9425046.
Douglass Cecil North. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/douglass-c-north-9425046 [Accessed 25 May 2013].
"Douglass Cecil North." 2013. The Biography Channel website. May 25 2013, 03:20 http://www.biography.com/people/douglass-c-north-9425046.
"Douglass Cecil North," The Biography Channel website, 2013, http://www.biography.com/people/douglass-c-north-9425046 [accessed May 25, 2013].
"Douglass Cecil North," The Biography Channel website, http://www.biography.com/people/douglass-c-north-9425046 (accessed May 25, 2013).
Douglass Cecil North [Internet]. The Biography Channel website; 2013 [cited 2013 May 25] Available from: http://www.biography.com/people/douglass-c-north-9425046.
Douglass Cecil North, http://www.biography.com/people/douglass-c-north-9425046 (last visited May 25, 2013).
Douglass Cecil North. The Biography Channel website. 2013. Available at: http://www.biography.com/people/douglass-c-north-9425046. Accessed May 25, 2013.