William S. Halsted was a pioneer of scientific surgery who opened a surgical school at Johns Hopkins University.
William S. Haltsted. (2013). The Biography Channel website. Retrieved 07:38, Jun 18, 2013, from http://www.biography.com/people/william-s-halsted-9326322.
William S. Haltsted. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/william-s-halsted-9326322 [Accessed 18 Jun 2013].
"William S. Haltsted." 2013. The Biography Channel website. Jun 18 2013, 07:38 http://www.biography.com/people/william-s-halsted-9326322.
"William S. Haltsted," The Biography Channel website, 2013, http://www.biography.com/people/william-s-halsted-9326322 [accessed Jun 18, 2013].
"William S. Haltsted," The Biography Channel website, http://www.biography.com/people/william-s-halsted-9326322 (accessed Jun 18, 2013).
William S. Haltsted [Internet]. The Biography Channel website; 2013 [cited 2013 Jun 18] Available from: http://www.biography.com/people/william-s-halsted-9326322.
William S. Haltsted, http://www.biography.com/people/william-s-halsted-9326322 (last visited Jun 18, 2013).
William S. Haltsted. The Biography Channel website. 2013. Available at: http://www.biography.com/people/william-s-halsted-9326322. Accessed Jun 18, 2013.