The Monongah coal mine disaster. (2013). The History Channel website. Retrieved 4:03, June 19, 2013, from http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster.
The Monongah coal mine disaster. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster [Accessed 19 Jun 2013].
“The Monongah coal mine disaster.” 2013. The History Channel website. Jun 19 2013, 4:03 http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster.
“The Monongah coal mine disaster,” The History Channel website, 2013, http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster [accessed Jun 19, 2013].
“The Monongah coal mine disaster,” The History Channel website, http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster (accessed Jun 19, 2013).
The Monongah coal mine disaster [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster.
The Monongah coal mine disaster, http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster (last visited Jun 19, 2013).
The Monongah coal mine disaster. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/the-monongah-coal-mine-disaster. Accessed Jun 19, 2013.