George Selden patents gas-powered car. (2013). The History Channel website. Retrieved 10:57, June 19, 2013, from http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car.
George Selden patents gas-powered car. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car [Accessed 19 Jun 2013].
“George Selden patents gas-powered car.” 2013. The History Channel website. Jun 19 2013, 10:57 http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car.
“George Selden patents gas-powered car,” The History Channel website, 2013, http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car [accessed Jun 19, 2013].
“George Selden patents gas-powered car,” The History Channel website, http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car (accessed Jun 19, 2013).
George Selden patents gas-powered car [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car.
George Selden patents gas-powered car, http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car (last visited Jun 19, 2013).
George Selden patents gas-powered car. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/george-selden-patents-gas-powered-car. Accessed Jun 19, 2013.