An American orbits earth. (2013). The History Channel website. Retrieved 7:17, June 18, 2013, from http://www.history.com/this-day-in-history/an-american-orbits-earth.
An American orbits earth. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/an-american-orbits-earth [Accessed 18 Jun 2013].
“An American orbits earth.” 2013. The History Channel website. Jun 18 2013, 7:17 http://www.history.com/this-day-in-history/an-american-orbits-earth.
“An American orbits earth,” The History Channel website, 2013, http://www.history.com/this-day-in-history/an-american-orbits-earth [accessed Jun 18, 2013].
“An American orbits earth,” The History Channel website, http://www.history.com/this-day-in-history/an-american-orbits-earth (accessed Jun 18, 2013).
An American orbits earth [Internet]. The History Channel website; 2013 [cited 2013 Jun 18] Available from: http://www.history.com/this-day-in-history/an-american-orbits-earth.
An American orbits earth, http://www.history.com/this-day-in-history/an-american-orbits-earth (last visited Jun 18, 2013).
An American orbits earth. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/an-american-orbits-earth. Accessed Jun 18, 2013.