New sound process for films announced. (2013). The History Channel website. Retrieved 3:07, May 20, 2013, from http://www.history.com/this-day-in-history/new-sound-process-for-films-announced.
New sound process for films announced. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/new-sound-process-for-films-announced [Accessed 20 May 2013].
“New sound process for films announced.” 2013. The History Channel website. May 20 2013, 3:07 http://www.history.com/this-day-in-history/new-sound-process-for-films-announced.
“New sound process for films announced,” The History Channel website, 2013, http://www.history.com/this-day-in-history/new-sound-process-for-films-announced [accessed May 20, 2013].
“New sound process for films announced,” The History Channel website, http://www.history.com/this-day-in-history/new-sound-process-for-films-announced (accessed May 20, 2013).
New sound process for films announced [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/new-sound-process-for-films-announced.
New sound process for films announced, http://www.history.com/this-day-in-history/new-sound-process-for-films-announced (last visited May 20, 2013).
New sound process for films announced. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/new-sound-process-for-films-announced. Accessed May 20, 2013.