National League of baseball is founded. (2013). The History Channel website. Retrieved 11:37, June 19, 2013, from http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded.
National League of baseball is founded. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded [Accessed 19 Jun 2013].
“National League of baseball is founded.” 2013. The History Channel website. Jun 19 2013, 11:37 http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded.
“National League of baseball is founded,” The History Channel website, 2013, http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded [accessed Jun 19, 2013].
“National League of baseball is founded,” The History Channel website, http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded (accessed Jun 19, 2013).
National League of baseball is founded [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded.
National League of baseball is founded, http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded (last visited Jun 19, 2013).
National League of baseball is founded. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/national-league-of-baseball-is-founded. Accessed Jun 19, 2013.