U.S. takes San Francisco. (2013). The History Channel website. Retrieved 6:10, June 20, 2013, from http://www.history.com/this-day-in-history/us-takes-san-francisco.
U.S. takes San Francisco. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/us-takes-san-francisco [Accessed 20 Jun 2013].
“U.S. takes San Francisco.” 2013. The History Channel website. Jun 20 2013, 6:10 http://www.history.com/this-day-in-history/us-takes-san-francisco.
“U.S. takes San Francisco,” The History Channel website, 2013, http://www.history.com/this-day-in-history/us-takes-san-francisco [accessed Jun 20, 2013].
“U.S. takes San Francisco,” The History Channel website, http://www.history.com/this-day-in-history/us-takes-san-francisco (accessed Jun 20, 2013).
U.S. takes San Francisco [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/us-takes-san-francisco.
U.S. takes San Francisco, http://www.history.com/this-day-in-history/us-takes-san-francisco (last visited Jun 20, 2013).
U.S. takes San Francisco. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/us-takes-san-francisco. Accessed Jun 20, 2013.