First transcontinental railroad is completed. (2013). The History Channel website. Retrieved 12:45, June 20, 2013, from http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed.
First transcontinental railroad is completed. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed [Accessed 20 Jun 2013].
“First transcontinental railroad is completed.” 2013. The History Channel website. Jun 20 2013, 12:45 http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed.
“First transcontinental railroad is completed,” The History Channel website, 2013, http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed [accessed Jun 20, 2013].
“First transcontinental railroad is completed,” The History Channel website, http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed (accessed Jun 20, 2013).
First transcontinental railroad is completed [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed.
First transcontinental railroad is completed, http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed (last visited Jun 20, 2013).
First transcontinental railroad is completed. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/first-transcontinental-railroad-is-completed. Accessed Jun 20, 2013.