Charlemagne. (2013). The History Channel website. Retrieved 8:34, May 23, 2013, from http://www.history.com/topics/charlemagne.
Charlemagne. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/topics/charlemagne [Accessed 23 May 2013].
“Charlemagne.” 2013. The History Channel website. May 23 2013, 8:34 http://www.history.com/topics/charlemagne.
“Charlemagne,” The History Channel website, 2013, http://www.history.com/topics/charlemagne [accessed May 23, 2013].
“Charlemagne,” The History Channel website, http://www.history.com/topics/charlemagne (accessed May 23, 2013).
Charlemagne [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/topics/charlemagne.
Charlemagne, http://www.history.com/topics/charlemagne (last visited May 23, 2013).
Charlemagne. The History Channel website. 2013. Available at: http://www.history.com/topics/charlemagne. Accessed May 23, 2013.