Nikita Khrushchev challenges United States to a missile. (2013). The History Channel website. Retrieved 7:18, June 18, 2013, from http://www.history.com/.
Nikita Khrushchev challenges United States to a missile. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/ [Accessed 18 Jun 2013].
“Nikita Khrushchev challenges United States to a missile.” 2013. The History Channel website. Jun 18 2013, 7:18 http://www.history.com/.
“Nikita Khrushchev challenges United States to a missile,” The History Channel website, 2013, http://www.history.com/ [accessed Jun 18, 2013].
“Nikita Khrushchev challenges United States to a missile,” The History Channel website, http://www.history.com/ (accessed Jun 18, 2013).
Nikita Khrushchev challenges United States to a missile [Internet]. The History Channel website; 2013 [cited 2013 Jun 18] Available from: http://www.history.com/.
Nikita Khrushchev challenges United States to a missile, http://www.history.com/ (last visited Jun 18, 2013).
Nikita Khrushchev challenges United States to a missile. The History Channel website. 2013. Available at: http://www.history.com/. Accessed Jun 18, 2013.