Solar-energy system installed at White House. (2013). The History Channel website. Retrieved 4:49, June 19, 2013, from http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house.
Solar-energy system installed at White House. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house [Accessed 19 Jun 2013].
“Solar-energy system installed at White House.” 2013. The History Channel website. Jun 19 2013, 4:49 http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house.
“Solar-energy system installed at White House,” The History Channel website, 2013, http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house [accessed Jun 19, 2013].
“Solar-energy system installed at White House,” The History Channel website, http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house (accessed Jun 19, 2013).
Solar-energy system installed at White House [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house.
Solar-energy system installed at White House, http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house (last visited Jun 19, 2013).
Solar-energy system installed at White House. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/solar-energy-system-installed-at-white-house. Accessed Jun 19, 2013.