Nixon signs national speed limit into law. (2013). The History Channel website. Retrieved 10:27, May 25, 2013, from http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law.
Nixon signs national speed limit into law. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law [Accessed 25 May 2013].
“Nixon signs national speed limit into law.” 2013. The History Channel website. May 25 2013, 10:27 http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law.
“Nixon signs national speed limit into law,” The History Channel website, 2013, http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law [accessed May 25, 2013].
“Nixon signs national speed limit into law,” The History Channel website, http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law (accessed May 25, 2013).
Nixon signs national speed limit into law [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law.
Nixon signs national speed limit into law, http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law (last visited May 25, 2013).
Nixon signs national speed limit into law. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/nixon-signs-national-speed-limit-into-law. Accessed May 25, 2013.