Pudge Heffelfinger becomes first pro football player. (2013). The History Channel website. Retrieved 7:00, May 23, 2013, from http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player.
Pudge Heffelfinger becomes first pro football player. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player [Accessed 23 May 2013].
“Pudge Heffelfinger becomes first pro football player.” 2013. The History Channel website. May 23 2013, 7:00 http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player.
“Pudge Heffelfinger becomes first pro football player,” The History Channel website, 2013, http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player [accessed May 23, 2013].
“Pudge Heffelfinger becomes first pro football player,” The History Channel website, http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player (accessed May 23, 2013).
Pudge Heffelfinger becomes first pro football player [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player.
Pudge Heffelfinger becomes first pro football player, http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player (last visited May 23, 2013).
Pudge Heffelfinger becomes first pro football player. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/pudge-heffelfinger-becomes-first-pro-football-player. Accessed May 23, 2013.