United States tests first hydrogen bomb. (2013). The History Channel website. Retrieved 7:53, May 20, 2013, from http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb.
United States tests first hydrogen bomb. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb [Accessed 20 May 2013].
“United States tests first hydrogen bomb.” 2013. The History Channel website. May 20 2013, 7:53 http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb.
“United States tests first hydrogen bomb,” The History Channel website, 2013, http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb [accessed May 20, 2013].
“United States tests first hydrogen bomb,” The History Channel website, http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb (accessed May 20, 2013).
United States tests first hydrogen bomb [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb.
United States tests first hydrogen bomb, http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb (last visited May 20, 2013).
United States tests first hydrogen bomb. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/united-states-tests-first-hydrogen-bomb. Accessed May 20, 2013.