Physicist Joseph Henry aided Samuel F.B. Morse in developing the telegraph. He also discovered several important principles of electricity.
Joseph Henry. (2013). The Biography Channel website. Retrieved 03:29, Jun 20, 2013, from http://www.biography.com/people/joseph-henry-9335457.
Joseph Henry. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/joseph-henry-9335457 [Accessed 20 Jun 2013].
"Joseph Henry." 2013. The Biography Channel website. Jun 20 2013, 03:29 http://www.biography.com/people/joseph-henry-9335457.
"Joseph Henry," The Biography Channel website, 2013, http://www.biography.com/people/joseph-henry-9335457 [accessed Jun 20, 2013].
"Joseph Henry," The Biography Channel website, http://www.biography.com/people/joseph-henry-9335457 (accessed Jun 20, 2013).
Joseph Henry [Internet]. The Biography Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.biography.com/people/joseph-henry-9335457.
Joseph Henry, http://www.biography.com/people/joseph-henry-9335457 (last visited Jun 20, 2013).
Joseph Henry. The Biography Channel website. 2013. Available at: http://www.biography.com/people/joseph-henry-9335457. Accessed Jun 20, 2013.