President Nixon refuses to hand over tapes. (2013). The History Channel website. Retrieved 8:56, May 19, 2013, from http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes.
President Nixon refuses to hand over tapes. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes [Accessed 19 May 2013].
“President Nixon refuses to hand over tapes.” 2013. The History Channel website. May 19 2013, 8:56 http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes.
“President Nixon refuses to hand over tapes,” The History Channel website, 2013, http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes [accessed May 19, 2013].
“President Nixon refuses to hand over tapes,” The History Channel website, http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes (accessed May 19, 2013).
President Nixon refuses to hand over tapes [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes.
President Nixon refuses to hand over tapes, http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes (last visited May 19, 2013).
President Nixon refuses to hand over tapes. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/president-nixon-refuses-to-hand-over-tapes. Accessed May 19, 2013.