Allies begin major counter-offensive in Second Battle of the Marne. (2013). The History Channel website. Retrieved 6:22, May 21, 2013, from http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne.
Allies begin major counter-offensive in Second Battle of the Marne. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne [Accessed 21 May 2013].
“Allies begin major counter-offensive in Second Battle of the Marne.” 2013. The History Channel website. May 21 2013, 6:22 http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne.
“Allies begin major counter-offensive in Second Battle of the Marne,” The History Channel website, 2013, http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne [accessed May 21, 2013].
“Allies begin major counter-offensive in Second Battle of the Marne,” The History Channel website, http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne (accessed May 21, 2013).
Allies begin major counter-offensive in Second Battle of the Marne [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne.
Allies begin major counter-offensive in Second Battle of the Marne, http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne (last visited May 21, 2013).
Allies begin major counter-offensive in Second Battle of the Marne. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/allies-begin-major-counter-offensive-in-second-battle-of-the-marne. Accessed May 21, 2013.