American poet Robert Penn Warren was one of the founders of New Criticism and is the only person to have won the Pulitzer Prize for both fiction and poetry.
Robert Penn Warren. (2013). The Biography Channel website. Retrieved 08:42, May 23, 2013, from http://www.biography.com/people/robert-penn-warren-9524366.
Robert Penn Warren. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/robert-penn-warren-9524366 [Accessed 23 May 2013].
"Robert Penn Warren." 2013. The Biography Channel website. May 23 2013, 08:42 http://www.biography.com/people/robert-penn-warren-9524366.
"Robert Penn Warren," The Biography Channel website, 2013, http://www.biography.com/people/robert-penn-warren-9524366 [accessed May 23, 2013].
"Robert Penn Warren," The Biography Channel website, http://www.biography.com/people/robert-penn-warren-9524366 (accessed May 23, 2013).
Robert Penn Warren [Internet]. The Biography Channel website; 2013 [cited 2013 May 23] Available from: http://www.biography.com/people/robert-penn-warren-9524366.
Robert Penn Warren, http://www.biography.com/people/robert-penn-warren-9524366 (last visited May 23, 2013).
Robert Penn Warren. The Biography Channel website. 2013. Available at: http://www.biography.com/people/robert-penn-warren-9524366. Accessed May 23, 2013.