American League adopts designated hitter rule. (2013). The History Channel website. Retrieved 1:47, May 20, 2013, from http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule.
American League adopts designated hitter rule. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule [Accessed 20 May 2013].
“American League adopts designated hitter rule.” 2013. The History Channel website. May 20 2013, 1:47 http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule.
“American League adopts designated hitter rule,” The History Channel website, 2013, http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule [accessed May 20, 2013].
“American League adopts designated hitter rule,” The History Channel website, http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule (accessed May 20, 2013).
American League adopts designated hitter rule [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule.
American League adopts designated hitter rule, http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule (last visited May 20, 2013).
American League adopts designated hitter rule. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/american-league-adopts-designated-hitter-rule. Accessed May 20, 2013.