The Battle of Britain escalates. (2013). The History Channel website. Retrieved 9:27, May 19, 2013, from http://www.history.com/this-day-in-history/the-battle-of-britain-escalates.
The Battle of Britain escalates. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/the-battle-of-britain-escalates [Accessed 19 May 2013].
“The Battle of Britain escalates.” 2013. The History Channel website. May 19 2013, 9:27 http://www.history.com/this-day-in-history/the-battle-of-britain-escalates.
“The Battle of Britain escalates,” The History Channel website, 2013, http://www.history.com/this-day-in-history/the-battle-of-britain-escalates [accessed May 19, 2013].
“The Battle of Britain escalates,” The History Channel website, http://www.history.com/this-day-in-history/the-battle-of-britain-escalates (accessed May 19, 2013).
The Battle of Britain escalates [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/the-battle-of-britain-escalates.
The Battle of Britain escalates, http://www.history.com/this-day-in-history/the-battle-of-britain-escalates (last visited May 19, 2013).
The Battle of Britain escalates. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/the-battle-of-britain-escalates. Accessed May 19, 2013.