U.S. takes control of Puerto Rico. (2013). The History Channel website. Retrieved 3:42, May 20, 2013, from http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico.
U.S. takes control of Puerto Rico. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico [Accessed 20 May 2013].
“U.S. takes control of Puerto Rico.” 2013. The History Channel website. May 20 2013, 3:42 http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico.
“U.S. takes control of Puerto Rico,” The History Channel website, 2013, http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico [accessed May 20, 2013].
“U.S. takes control of Puerto Rico,” The History Channel website, http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico (accessed May 20, 2013).
U.S. takes control of Puerto Rico [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico.
U.S. takes control of Puerto Rico, http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico (last visited May 20, 2013).
U.S. takes control of Puerto Rico. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/us-takes-control-of-puerto-rico. Accessed May 20, 2013.