Robert Frost leaves for a goodwill tour of U.S.S.R.. (2013). The History Channel website. Retrieved 4:14, May 24, 2013, from http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr.
Robert Frost leaves for a goodwill tour of U.S.S.R.. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr [Accessed 24 May 2013].
“Robert Frost leaves for a goodwill tour of U.S.S.R..” 2013. The History Channel website. May 24 2013, 4:14 http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr.
“Robert Frost leaves for a goodwill tour of U.S.S.R.,” The History Channel website, 2013, http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr [accessed May 24, 2013].
“Robert Frost leaves for a goodwill tour of U.S.S.R.,” The History Channel website, http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr (accessed May 24, 2013).
Robert Frost leaves for a goodwill tour of U.S.S.R. [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr.
Robert Frost leaves for a goodwill tour of U.S.S.R., http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr (last visited May 24, 2013).
Robert Frost leaves for a goodwill tour of U.S.S.R.. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/robert-frost-leaves-for-a-goodwill-tour-of-ussr. Accessed May 24, 2013.