Four black schoolgirls killed in Birmingham. (2013). The History Channel website. Retrieved 8:42, June 20, 2013, from http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham.
Four black schoolgirls killed in Birmingham. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham [Accessed 20 Jun 2013].
“Four black schoolgirls killed in Birmingham.” 2013. The History Channel website. Jun 20 2013, 8:42 http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham.
“Four black schoolgirls killed in Birmingham,” The History Channel website, 2013, http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham [accessed Jun 20, 2013].
“Four black schoolgirls killed in Birmingham,” The History Channel website, http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham (accessed Jun 20, 2013).
Four black schoolgirls killed in Birmingham [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham.
Four black schoolgirls killed in Birmingham, http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham (last visited Jun 20, 2013).
Four black schoolgirls killed in Birmingham. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/four-black-schoolgirls-killed-in-birmingham. Accessed Jun 20, 2013.