A former postal worker commits mass murder. (2013). The History Channel website. Retrieved 5:49, June 19, 2013, from http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder.
A former postal worker commits mass murder. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder [Accessed 19 Jun 2013].
“A former postal worker commits mass murder.” 2013. The History Channel website. Jun 19 2013, 5:49 http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder.
“A former postal worker commits mass murder,” The History Channel website, 2013, http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder [accessed Jun 19, 2013].
“A former postal worker commits mass murder,” The History Channel website, http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder (accessed Jun 19, 2013).
A former postal worker commits mass murder [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder.
A former postal worker commits mass murder, http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder (last visited Jun 19, 2013).
A former postal worker commits mass murder. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/a-former-postal-worker-commits-mass-murder. Accessed Jun 19, 2013.