Soviet cosmonaut is killed. (2013). The History Channel website. Retrieved 12:54, May 24, 2013, from http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed.
Soviet cosmonaut is killed. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed [Accessed 24 May 2013].
“Soviet cosmonaut is killed.” 2013. The History Channel website. May 24 2013, 12:54 http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed.
“Soviet cosmonaut is killed,” The History Channel website, 2013, http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed [accessed May 24, 2013].
“Soviet cosmonaut is killed,” The History Channel website, http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed (accessed May 24, 2013).
Soviet cosmonaut is killed [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed.
Soviet cosmonaut is killed, http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed (last visited May 24, 2013).
Soviet cosmonaut is killed. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/soviet-cosmonaut-is-killed. Accessed May 24, 2013.