New York World's Fair opens. (2013). The History Channel website. Retrieved 4:01, June 20, 2013, from http://www.history.com/this-day-in-history/new-york-worlds-fair-opens.
New York World's Fair opens. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/new-york-worlds-fair-opens [Accessed 20 Jun 2013].
“New York World's Fair opens.” 2013. The History Channel website. Jun 20 2013, 4:01 http://www.history.com/this-day-in-history/new-york-worlds-fair-opens.
“New York World's Fair opens,” The History Channel website, 2013, http://www.history.com/this-day-in-history/new-york-worlds-fair-opens [accessed Jun 20, 2013].
“New York World's Fair opens,” The History Channel website, http://www.history.com/this-day-in-history/new-york-worlds-fair-opens (accessed Jun 20, 2013).
New York World's Fair opens [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/new-york-worlds-fair-opens.
New York World's Fair opens, http://www.history.com/this-day-in-history/new-york-worlds-fair-opens (last visited Jun 20, 2013).
New York World's Fair opens. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/new-york-worlds-fair-opens. Accessed Jun 20, 2013.