Second Battle of Ypres begins. (2013). The History Channel website. Retrieved 12:34, June 19, 2013, from http://www.history.com/this-day-in-history/second-battle-of-ypres-begins.
Second Battle of Ypres begins. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/second-battle-of-ypres-begins [Accessed 19 Jun 2013].
“Second Battle of Ypres begins.” 2013. The History Channel website. Jun 19 2013, 12:34 http://www.history.com/this-day-in-history/second-battle-of-ypres-begins.
“Second Battle of Ypres begins,” The History Channel website, 2013, http://www.history.com/this-day-in-history/second-battle-of-ypres-begins [accessed Jun 19, 2013].
“Second Battle of Ypres begins,” The History Channel website, http://www.history.com/this-day-in-history/second-battle-of-ypres-begins (accessed Jun 19, 2013).
Second Battle of Ypres begins [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/second-battle-of-ypres-begins.
Second Battle of Ypres begins, http://www.history.com/this-day-in-history/second-battle-of-ypres-begins (last visited Jun 19, 2013).
Second Battle of Ypres begins. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/second-battle-of-ypres-begins. Accessed Jun 19, 2013.