B-52s begin bombing North Vietnam. (2013). The History Channel website. Retrieved 10:29, May 18, 2013, from http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam.
B-52s begin bombing North Vietnam. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam [Accessed 18 May 2013].
“B-52s begin bombing North Vietnam.” 2013. The History Channel website. May 18 2013, 10:29 http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam.
“B-52s begin bombing North Vietnam,” The History Channel website, 2013, http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam [accessed May 18, 2013].
“B-52s begin bombing North Vietnam,” The History Channel website, http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam (accessed May 18, 2013).
B-52s begin bombing North Vietnam [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam.
B-52s begin bombing North Vietnam, http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam (last visited May 18, 2013).
B-52s begin bombing North Vietnam. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/b-52s-begin-bombing-north-vietnam. Accessed May 18, 2013.