Thomas Edison on the Development of Electricity. (2013). The History Channel website. Retrieved 11:25, May 24, 2013, from http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity.
Thomas Edison on the Development of Electricity. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity [Accessed 24 May 2013].
“Thomas Edison on the Development of Electricity.” 2013. The History Channel website. May 24 2013, 11:25 http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity.
“Thomas Edison on the Development of Electricity,” The History Channel website, 2013, http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity [accessed May 24, 2013].
“Thomas Edison on the Development of Electricity,” The History Channel website, http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity (accessed May 24, 2013).
Thomas Edison on the Development of Electricity [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity.
Thomas Edison on the Development of Electricity, http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity (last visited May 24, 2013).
Thomas Edison on the Development of Electricity. The History Channel website. 2013. Available at: http://www.history.com/speeches/thomas-edison-on-the-development-of-electricity. Accessed May 24, 2013.