Congress opens all U.S. ports to international trade. (2013). The History Channel website. Retrieved 9:35, May 21, 2013, from http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade.
Congress opens all U.S. ports to international trade. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade [Accessed 21 May 2013].
“Congress opens all U.S. ports to international trade.” 2013. The History Channel website. May 21 2013, 9:35 http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade.
“Congress opens all U.S. ports to international trade,” The History Channel website, 2013, http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade [accessed May 21, 2013].
“Congress opens all U.S. ports to international trade,” The History Channel website, http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade (accessed May 21, 2013).
Congress opens all U.S. ports to international trade [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade.
Congress opens all U.S. ports to international trade, http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade (last visited May 21, 2013).
Congress opens all U.S. ports to international trade. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/congress-opens-all-us-ports-to-international-trade. Accessed May 21, 2013.