Pennsylvania ratifies the Constitution. (2013). The History Channel website. Retrieved 8:23, May 18, 2013, from http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution.
Pennsylvania ratifies the Constitution. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution [Accessed 18 May 2013].
“Pennsylvania ratifies the Constitution.” 2013. The History Channel website. May 18 2013, 8:23 http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution.
“Pennsylvania ratifies the Constitution,” The History Channel website, 2013, http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution [accessed May 18, 2013].
“Pennsylvania ratifies the Constitution,” The History Channel website, http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution (accessed May 18, 2013).
Pennsylvania ratifies the Constitution [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution.
Pennsylvania ratifies the Constitution, http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution (last visited May 18, 2013).
Pennsylvania ratifies the Constitution. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/pennsylvania-ratifies-the-constitution. Accessed May 18, 2013.