Chunnel makes breakthrough. (2013). The History Channel website. Retrieved 3:44, May 19, 2013, from http://www.history.com/this-day-in-history/chunnel--makes-breakthrough.
Chunnel makes breakthrough. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/chunnel--makes-breakthrough [Accessed 19 May 2013].
“Chunnel makes breakthrough.” 2013. The History Channel website. May 19 2013, 3:44 http://www.history.com/this-day-in-history/chunnel--makes-breakthrough.
“Chunnel makes breakthrough,” The History Channel website, 2013, http://www.history.com/this-day-in-history/chunnel--makes-breakthrough [accessed May 19, 2013].
“Chunnel makes breakthrough,” The History Channel website, http://www.history.com/this-day-in-history/chunnel--makes-breakthrough (accessed May 19, 2013).
Chunnel makes breakthrough [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/chunnel--makes-breakthrough.
Chunnel makes breakthrough, http://www.history.com/this-day-in-history/chunnel--makes-breakthrough (last visited May 19, 2013).
Chunnel makes breakthrough. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/chunnel--makes-breakthrough. Accessed May 19, 2013.