Russian czar abdicates. (2013). The History Channel website. Retrieved 12:26, May 19, 2013, from http://www.history.com/this-day-in-history/russian-czar-abdicates.
Russian czar abdicates. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/russian-czar-abdicates [Accessed 19 May 2013].
“Russian czar abdicates.” 2013. The History Channel website. May 19 2013, 12:26 http://www.history.com/this-day-in-history/russian-czar-abdicates.
“Russian czar abdicates,” The History Channel website, 2013, http://www.history.com/this-day-in-history/russian-czar-abdicates [accessed May 19, 2013].
“Russian czar abdicates,” The History Channel website, http://www.history.com/this-day-in-history/russian-czar-abdicates (accessed May 19, 2013).
Russian czar abdicates [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/russian-czar-abdicates.
Russian czar abdicates, http://www.history.com/this-day-in-history/russian-czar-abdicates (last visited May 19, 2013).
Russian czar abdicates. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/russian-czar-abdicates. Accessed May 19, 2013.