Thomas Alva Edison patents the phonograph. (2013). The History Channel website. Retrieved 9:55, May 25, 2013, from http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph.
Thomas Alva Edison patents the phonograph. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph [Accessed 25 May 2013].
“Thomas Alva Edison patents the phonograph.” 2013. The History Channel website. May 25 2013, 9:55 http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph.
“Thomas Alva Edison patents the phonograph,” The History Channel website, 2013, http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph [accessed May 25, 2013].
“Thomas Alva Edison patents the phonograph,” The History Channel website, http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph (accessed May 25, 2013).
Thomas Alva Edison patents the phonograph [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph.
Thomas Alva Edison patents the phonograph, http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph (last visited May 25, 2013).
Thomas Alva Edison patents the phonograph. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/thomas-alva-edison-patents-the-phonograph. Accessed May 25, 2013.