David Cone pitches perfect game. (2013). The History Channel website. Retrieved 5:21, May 25, 2013, from http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game.
David Cone pitches perfect game. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game [Accessed 25 May 2013].
“David Cone pitches perfect game.” 2013. The History Channel website. May 25 2013, 5:21 http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game.
“David Cone pitches perfect game,” The History Channel website, 2013, http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game [accessed May 25, 2013].
“David Cone pitches perfect game,” The History Channel website, http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game (accessed May 25, 2013).
David Cone pitches perfect game [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game.
David Cone pitches perfect game, http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game (last visited May 25, 2013).
David Cone pitches perfect game. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/david-cone-pitches-perfect-game. Accessed May 25, 2013.