German sub sinks U.S. passenger ship California. (2013). The History Channel website. Retrieved 5:39, May 18, 2013, from http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california.
German sub sinks U.S. passenger ship California. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california [Accessed 18 May 2013].
“German sub sinks U.S. passenger ship California.” 2013. The History Channel website. May 18 2013, 5:39 http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california.
“German sub sinks U.S. passenger ship California,” The History Channel website, 2013, http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california [accessed May 18, 2013].
“German sub sinks U.S. passenger ship California,” The History Channel website, http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california (accessed May 18, 2013).
German sub sinks U.S. passenger ship California [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california.
German sub sinks U.S. passenger ship California, http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california (last visited May 18, 2013).
German sub sinks U.S. passenger ship California. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/german-sub-sinks-us-passenger-ship-california. Accessed May 18, 2013.