British naval convoy system introduced. (2013). The History Channel website. Retrieved 12:12, May 22, 2013, from http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced.
British naval convoy system introduced. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced [Accessed 22 May 2013].
“British naval convoy system introduced.” 2013. The History Channel website. May 22 2013, 12:12 http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced.
“British naval convoy system introduced,” The History Channel website, 2013, http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced [accessed May 22, 2013].
“British naval convoy system introduced,” The History Channel website, http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced (accessed May 22, 2013).
British naval convoy system introduced [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced.
British naval convoy system introduced, http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced (last visited May 22, 2013).
British naval convoy system introduced. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/british-naval-convoy-system-introduced. Accessed May 22, 2013.