Johnson approves Operation Rolling Thunder. (2013). The History Channel website. Retrieved 9:24, May 21, 2013, from http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder.
Johnson approves Operation Rolling Thunder. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder [Accessed 21 May 2013].
“Johnson approves Operation Rolling Thunder.” 2013. The History Channel website. May 21 2013, 9:24 http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder.
“Johnson approves Operation Rolling Thunder,” The History Channel website, 2013, http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder [accessed May 21, 2013].
“Johnson approves Operation Rolling Thunder,” The History Channel website, http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder (accessed May 21, 2013).
Johnson approves Operation Rolling Thunder [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder.
Johnson approves Operation Rolling Thunder, http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder (last visited May 21, 2013).
Johnson approves Operation Rolling Thunder. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/johnson-approves-operation-rolling-thunder. Accessed May 21, 2013.