U.S. Congress passes Espionage Act. (2013). The History Channel website. Retrieved 1:27, May 20, 2013, from http://www.history.com/this-day-in-history/us-congress-passes-espionage-act.
U.S. Congress passes Espionage Act. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/us-congress-passes-espionage-act [Accessed 20 May 2013].
“U.S. Congress passes Espionage Act.” 2013. The History Channel website. May 20 2013, 1:27 http://www.history.com/this-day-in-history/us-congress-passes-espionage-act.
“U.S. Congress passes Espionage Act,” The History Channel website, 2013, http://www.history.com/this-day-in-history/us-congress-passes-espionage-act [accessed May 20, 2013].
“U.S. Congress passes Espionage Act,” The History Channel website, http://www.history.com/this-day-in-history/us-congress-passes-espionage-act (accessed May 20, 2013).
U.S. Congress passes Espionage Act [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/us-congress-passes-espionage-act.
U.S. Congress passes Espionage Act, http://www.history.com/this-day-in-history/us-congress-passes-espionage-act (last visited May 20, 2013).
U.S. Congress passes Espionage Act. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/us-congress-passes-espionage-act. Accessed May 20, 2013.