Tanks introduced into warfare at the Somme. (2013). The History Channel website. Retrieved 2:57, May 26, 2013, from http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme.
Tanks introduced into warfare at the Somme. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme [Accessed 26 May 2013].
“Tanks introduced into warfare at the Somme.” 2013. The History Channel website. May 26 2013, 2:57 http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme.
“Tanks introduced into warfare at the Somme,” The History Channel website, 2013, http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme [accessed May 26, 2013].
“Tanks introduced into warfare at the Somme,” The History Channel website, http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme (accessed May 26, 2013).
Tanks introduced into warfare at the Somme [Internet]. The History Channel website; 2013 [cited 2013 May 26] Available from: http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme.
Tanks introduced into warfare at the Somme, http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme (last visited May 26, 2013).
Tanks introduced into warfare at the Somme. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/tanks-introduced-into-warfare-at-the-somme. Accessed May 26, 2013.