Bush addresses the nation after space shuttle Columbia explodes. (2013). The History Channel website. Retrieved 3:06, May 20, 2013, from http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes.
Bush addresses the nation after space shuttle Columbia explodes. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes [Accessed 20 May 2013].
“Bush addresses the nation after space shuttle Columbia explodes.” 2013. The History Channel website. May 20 2013, 3:06 http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes.
“Bush addresses the nation after space shuttle Columbia explodes,” The History Channel website, 2013, http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes [accessed May 20, 2013].
“Bush addresses the nation after space shuttle Columbia explodes,” The History Channel website, http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes (accessed May 20, 2013).
Bush addresses the nation after space shuttle Columbia explodes [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes.
Bush addresses the nation after space shuttle Columbia explodes, http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes (last visited May 20, 2013).
Bush addresses the nation after space shuttle Columbia explodes. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/bush-addresses-the-nation-after-space-shuttle-icolumbiai-explodes. Accessed May 20, 2013.