Stephen M. Balzer patents rotary-engine auto. (2013). The History Channel website. Retrieved 1:50, June 19, 2013, from http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto.
Stephen M. Balzer patents rotary-engine auto. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto [Accessed 19 Jun 2013].
“Stephen M. Balzer patents rotary-engine auto.” 2013. The History Channel website. Jun 19 2013, 1:50 http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto.
“Stephen M. Balzer patents rotary-engine auto,” The History Channel website, 2013, http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto [accessed Jun 19, 2013].
“Stephen M. Balzer patents rotary-engine auto,” The History Channel website, http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto (accessed Jun 19, 2013).
Stephen M. Balzer patents rotary-engine auto [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto.
Stephen M. Balzer patents rotary-engine auto, http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto (last visited Jun 19, 2013).
Stephen M. Balzer patents rotary-engine auto. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/stephen-m-balzer-patents-rotary-engine-auto. Accessed Jun 19, 2013.