President Lyndon Johnson signs the Highway Beautification Act. (2013). The History Channel website. Retrieved 4:28, May 20, 2013, from http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act.
President Lyndon Johnson signs the Highway Beautification Act. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act [Accessed 20 May 2013].
“President Lyndon Johnson signs the Highway Beautification Act.” 2013. The History Channel website. May 20 2013, 4:28 http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act.
“President Lyndon Johnson signs the Highway Beautification Act,” The History Channel website, 2013, http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act [accessed May 20, 2013].
“President Lyndon Johnson signs the Highway Beautification Act,” The History Channel website, http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act (accessed May 20, 2013).
President Lyndon Johnson signs the Highway Beautification Act [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act.
President Lyndon Johnson signs the Highway Beautification Act, http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act (last visited May 20, 2013).
President Lyndon Johnson signs the Highway Beautification Act. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/president-lyndon-johnson-signs-the-highway-beautification-act. Accessed May 20, 2013.