Transcontinental railroad completed. (2013). The History Channel website. Retrieved 10:25, May 18, 2013, from http://www.history.com/this-day-in-history/transcontinental-railroad-completed.
Transcontinental railroad completed. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/transcontinental-railroad-completed [Accessed 18 May 2013].
“Transcontinental railroad completed.” 2013. The History Channel website. May 18 2013, 10:25 http://www.history.com/this-day-in-history/transcontinental-railroad-completed.
“Transcontinental railroad completed,” The History Channel website, 2013, http://www.history.com/this-day-in-history/transcontinental-railroad-completed [accessed May 18, 2013].
“Transcontinental railroad completed,” The History Channel website, http://www.history.com/this-day-in-history/transcontinental-railroad-completed (accessed May 18, 2013).
Transcontinental railroad completed [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/this-day-in-history/transcontinental-railroad-completed.
Transcontinental railroad completed, http://www.history.com/this-day-in-history/transcontinental-railroad-completed (last visited May 18, 2013).
Transcontinental railroad completed. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/transcontinental-railroad-completed. Accessed May 18, 2013.