Operation Lam Son 719 begins. (2013). The History Channel website. Retrieved 6:39, May 22, 2013, from http://www.history.com/this-day-in-history/operation-lam-son-719-begins.
Operation Lam Son 719 begins. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/operation-lam-son-719-begins [Accessed 22 May 2013].
“Operation Lam Son 719 begins.” 2013. The History Channel website. May 22 2013, 6:39 http://www.history.com/this-day-in-history/operation-lam-son-719-begins.
“Operation Lam Son 719 begins,” The History Channel website, 2013, http://www.history.com/this-day-in-history/operation-lam-son-719-begins [accessed May 22, 2013].
“Operation Lam Son 719 begins,” The History Channel website, http://www.history.com/this-day-in-history/operation-lam-son-719-begins (accessed May 22, 2013).
Operation Lam Son 719 begins [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/operation-lam-son-719-begins.
Operation Lam Son 719 begins, http://www.history.com/this-day-in-history/operation-lam-son-719-begins (last visited May 22, 2013).
Operation Lam Son 719 begins. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/operation-lam-son-719-begins. Accessed May 22, 2013.