Washington Monument completed. (2013). The History Channel website. Retrieved 8:28, May 21, 2013, from http://www.history.com/this-day-in-history/washington-monument-completed.
Washington Monument completed. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/washington-monument-completed [Accessed 21 May 2013].
“Washington Monument completed.” 2013. The History Channel website. May 21 2013, 8:28 http://www.history.com/this-day-in-history/washington-monument-completed.
“Washington Monument completed,” The History Channel website, 2013, http://www.history.com/this-day-in-history/washington-monument-completed [accessed May 21, 2013].
“Washington Monument completed,” The History Channel website, http://www.history.com/this-day-in-history/washington-monument-completed (accessed May 21, 2013).
Washington Monument completed [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/washington-monument-completed.
Washington Monument completed, http://www.history.com/this-day-in-history/washington-monument-completed (last visited May 21, 2013).
Washington Monument completed. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/washington-monument-completed. Accessed May 21, 2013.