Chicago has its first . (2013). The History Channel website. Retrieved 10:53, May 26, 2013, from http://www.history.com/.
Chicago has its first . [Internet]. 2013. The History Channel website. Available from: http://www.history.com/ [Accessed 26 May 2013].
“Chicago has its first .” 2013. The History Channel website. May 26 2013, 10:53 http://www.history.com/.
“Chicago has its first ,” The History Channel website, 2013, http://www.history.com/ [accessed May 26, 2013].
“Chicago has its first ,” The History Channel website, http://www.history.com/ (accessed May 26, 2013).
Chicago has its first [Internet]. The History Channel website; 2013 [cited 2013 May 26] Available from: http://www.history.com/.
Chicago has its first , http://www.history.com/ (last visited May 26, 2013).
Chicago has its first . The History Channel website. 2013. Available at: http://www.history.com/. Accessed May 26, 2013.