First U.S. air-combat mission begins. (2013). The History Channel website. Retrieved 8:20, May 23, 2013, from http://www.history.com/this-day-in-history/first-us-air-combat-mission.
First U.S. air-combat mission begins. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/first-us-air-combat-mission [Accessed 23 May 2013].
“First U.S. air-combat mission begins.” 2013. The History Channel website. May 23 2013, 8:20 http://www.history.com/this-day-in-history/first-us-air-combat-mission.
“First U.S. air-combat mission begins,” The History Channel website, 2013, http://www.history.com/this-day-in-history/first-us-air-combat-mission [accessed May 23, 2013].
“First U.S. air-combat mission begins,” The History Channel website, http://www.history.com/this-day-in-history/first-us-air-combat-mission (accessed May 23, 2013).
First U.S. air-combat mission begins [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/this-day-in-history/first-us-air-combat-mission.
First U.S. air-combat mission begins, http://www.history.com/this-day-in-history/first-us-air-combat-mission (last visited May 23, 2013).
First U.S. air-combat mission begins. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/first-us-air-combat-mission. Accessed May 23, 2013.