Robert Motherwell was an American painter best known for being an influential force in the abstract expressionism movement of the 1940s.
Robert Motherwell. (2013). The Biography Channel website. Retrieved 06:13, May 20, 2013, from http://www.biography.com/people/robert-motherwell-37602.
Robert Motherwell. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/robert-motherwell-37602 [Accessed 20 May 2013].
"Robert Motherwell." 2013. The Biography Channel website. May 20 2013, 06:13 http://www.biography.com/people/robert-motherwell-37602.
"Robert Motherwell," The Biography Channel website, 2013, http://www.biography.com/people/robert-motherwell-37602 [accessed May 20, 2013].
"Robert Motherwell," The Biography Channel website, http://www.biography.com/people/robert-motherwell-37602 (accessed May 20, 2013).
Robert Motherwell [Internet]. The Biography Channel website; 2013 [cited 2013 May 20] Available from: http://www.biography.com/people/robert-motherwell-37602.
Robert Motherwell, http://www.biography.com/people/robert-motherwell-37602 (last visited May 20, 2013).
Robert Motherwell. The Biography Channel website. 2013. Available at: http://www.biography.com/people/robert-motherwell-37602. Accessed May 20, 2013.