Legionnaire's Disease Mystery. (2013). The History Channel website. Retrieved 1:42, May 23, 2013, from http://www.history.com/speeches/legionnaires-disease-mystery.
Legionnaire's Disease Mystery. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/speeches/legionnaires-disease-mystery [Accessed 23 May 2013].
“Legionnaire's Disease Mystery.” 2013. The History Channel website. May 23 2013, 1:42 http://www.history.com/speeches/legionnaires-disease-mystery.
“Legionnaire's Disease Mystery,” The History Channel website, 2013, http://www.history.com/speeches/legionnaires-disease-mystery [accessed May 23, 2013].
“Legionnaire's Disease Mystery,” The History Channel website, http://www.history.com/speeches/legionnaires-disease-mystery (accessed May 23, 2013).
Legionnaire's Disease Mystery [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/speeches/legionnaires-disease-mystery.
Legionnaire's Disease Mystery, http://www.history.com/speeches/legionnaires-disease-mystery (last visited May 23, 2013).
Legionnaire's Disease Mystery. The History Channel website. 2013. Available at: http://www.history.com/speeches/legionnaires-disease-mystery. Accessed May 23, 2013.