Exxon Valdez runs aground in Alaska. (2013). The History Channel website. Retrieved 3:03, May 22, 2013, from http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska.
Exxon Valdez runs aground in Alaska. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska [Accessed 22 May 2013].
“Exxon Valdez runs aground in Alaska.” 2013. The History Channel website. May 22 2013, 3:03 http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska.
“Exxon Valdez runs aground in Alaska,” The History Channel website, 2013, http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska [accessed May 22, 2013].
“Exxon Valdez runs aground in Alaska,” The History Channel website, http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska (accessed May 22, 2013).
Exxon Valdez runs aground in Alaska [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska.
Exxon Valdez runs aground in Alaska, http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska (last visited May 22, 2013).
Exxon Valdez runs aground in Alaska. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/exxon-valdez-runs-aground-in-alaska. Accessed May 22, 2013.