Three-ship collision causes oil spill. (2013). The History Channel website. Retrieved 9:49, May 22, 2013, from http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill.
Three-ship collision causes oil spill. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill [Accessed 22 May 2013].
“Three-ship collision causes oil spill.” 2013. The History Channel website. May 22 2013, 9:49 http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill.
“Three-ship collision causes oil spill,” The History Channel website, 2013, http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill [accessed May 22, 2013].
“Three-ship collision causes oil spill,” The History Channel website, http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill (accessed May 22, 2013).
Three-ship collision causes oil spill [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill.
Three-ship collision causes oil spill, http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill (last visited May 22, 2013).
Three-ship collision causes oil spill. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/three-ship-collision-causes-oil-spill. Accessed May 22, 2013.