U.S. collegiate gridiron football coach John Heisman legalized the forward pass and originated the center snap. The Heisman Trophy was named after him.
John Heisman. (2013). The Biography Channel website. Retrieved 02:25, May 21, 2013, from http://www.biography.com/people/john-heisman-39478.
John Heisman. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/john-heisman-39478 [Accessed 21 May 2013].
"John Heisman." 2013. The Biography Channel website. May 21 2013, 02:25 http://www.biography.com/people/john-heisman-39478.
"John Heisman," The Biography Channel website, 2013, http://www.biography.com/people/john-heisman-39478 [accessed May 21, 2013].
"John Heisman," The Biography Channel website, http://www.biography.com/people/john-heisman-39478 (accessed May 21, 2013).
John Heisman [Internet]. The Biography Channel website; 2013 [cited 2013 May 21] Available from: http://www.biography.com/people/john-heisman-39478.
John Heisman, http://www.biography.com/people/john-heisman-39478 (last visited May 21, 2013).
John Heisman. The Biography Channel website. 2013. Available at: http://www.biography.com/people/john-heisman-39478. Accessed May 21, 2013.