U.S. fliers in first dogfight over western front. (2013). The History Channel website. Retrieved 9:43, May 21, 2013, from http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front.
U.S. fliers in first dogfight over western front. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front [Accessed 21 May 2013].
“U.S. fliers in first dogfight over western front.” 2013. The History Channel website. May 21 2013, 9:43 http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front.
“U.S. fliers in first dogfight over western front,” The History Channel website, 2013, http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front [accessed May 21, 2013].
“U.S. fliers in first dogfight over western front,” The History Channel website, http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front (accessed May 21, 2013).
U.S. fliers in first dogfight over western front [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front.
U.S. fliers in first dogfight over western front, http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front (last visited May 21, 2013).
U.S. fliers in first dogfight over western front. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/us-fliers-in-first-dogfight-over-western-front. Accessed May 21, 2013.