Stephen Hawking breaks British bestseller records. (2013). The History Channel website. Retrieved 9:28, May 22, 2013, from http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records.
Stephen Hawking breaks British bestseller records. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records [Accessed 22 May 2013].
“Stephen Hawking breaks British bestseller records.” 2013. The History Channel website. May 22 2013, 9:28 http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records.
“Stephen Hawking breaks British bestseller records,” The History Channel website, 2013, http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records [accessed May 22, 2013].
“Stephen Hawking breaks British bestseller records,” The History Channel website, http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records (accessed May 22, 2013).
Stephen Hawking breaks British bestseller records [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records.
Stephen Hawking breaks British bestseller records, http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records (last visited May 22, 2013).
Stephen Hawking breaks British bestseller records. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/stephen-hawkings-breaks-british-bestseller-records. Accessed May 22, 2013.