California governor signs new auto emissions legislation. (2013). The History Channel website. Retrieved 4:42, June 19, 2013, from http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation.
California governor signs new auto emissions legislation. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation [Accessed 19 Jun 2013].
“California governor signs new auto emissions legislation.” 2013. The History Channel website. Jun 19 2013, 4:42 http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation.
“California governor signs new auto emissions legislation,” The History Channel website, 2013, http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation [accessed Jun 19, 2013].
“California governor signs new auto emissions legislation,” The History Channel website, http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation (accessed Jun 19, 2013).
California governor signs new auto emissions legislation [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation.
California governor signs new auto emissions legislation, http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation (last visited Jun 19, 2013).
California governor signs new auto emissions legislation. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/california-governor-signs-new-auto-emissions-legislation. Accessed Jun 19, 2013.