Reagan's doctors discover possibly cancerous colon polyp. (2013). The History Channel website. Retrieved 10:54, May 26, 2013, from http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp.
Reagan's doctors discover possibly cancerous colon polyp. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp [Accessed 26 May 2013].
“Reagan's doctors discover possibly cancerous colon polyp.” 2013. The History Channel website. May 26 2013, 10:54 http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp.
“Reagan's doctors discover possibly cancerous colon polyp,” The History Channel website, 2013, http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp [accessed May 26, 2013].
“Reagan's doctors discover possibly cancerous colon polyp,” The History Channel website, http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp (accessed May 26, 2013).
Reagan's doctors discover possibly cancerous colon polyp [Internet]. The History Channel website; 2013 [cited 2013 May 26] Available from: http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp.
Reagan's doctors discover possibly cancerous colon polyp, http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp (last visited May 26, 2013).
Reagan's doctors discover possibly cancerous colon polyp. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/reagans-doctors-discover-possibly-cancerous-colon-polyp. Accessed May 26, 2013.