U.S. aid to Contras signed into law. (2013). The History Channel website. Retrieved 4:37, June 20, 2013, from http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law.
U.S. aid to Contras signed into law. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law [Accessed 20 Jun 2013].
“U.S. aid to Contras signed into law.” 2013. The History Channel website. Jun 20 2013, 4:37 http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law.
“U.S. aid to Contras signed into law,” The History Channel website, 2013, http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law [accessed Jun 20, 2013].
“U.S. aid to Contras signed into law,” The History Channel website, http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law (accessed Jun 20, 2013).
U.S. aid to Contras signed into law [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law.
U.S. aid to Contras signed into law, http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law (last visited Jun 20, 2013).
U.S. aid to Contras signed into law. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/us-aid-to-contras-signed-into-law. Accessed Jun 20, 2013.