Hanoi prepares for more air attacks. (2013). The History Channel website. Retrieved 10:18, May 23, 2013, from http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks.
Hanoi prepares for more air attacks. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks [Accessed 23 May 2013].
“Hanoi prepares for more air attacks.” 2013. The History Channel website. May 23 2013, 10:18 http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks.
“Hanoi prepares for more air attacks,” The History Channel website, 2013, http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks [accessed May 23, 2013].
“Hanoi prepares for more air attacks,” The History Channel website, http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks (accessed May 23, 2013).
Hanoi prepares for more air attacks [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks.
Hanoi prepares for more air attacks, http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks (last visited May 23, 2013).
Hanoi prepares for more air attacks. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/hanoi-prepares-for-more-air-attacks. Accessed May 23, 2013.