Leif Erickson Tunnel completes 1,593-mile I-35. (2013). The History Channel website. Retrieved 1:54, May 22, 2013, from http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35.
Leif Erickson Tunnel completes 1,593-mile I-35. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35 [Accessed 22 May 2013].
“Leif Erickson Tunnel completes 1,593-mile I-35.” 2013. The History Channel website. May 22 2013, 1:54 http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35.
“Leif Erickson Tunnel completes 1,593-mile I-35,” The History Channel website, 2013, http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35 [accessed May 22, 2013].
“Leif Erickson Tunnel completes 1,593-mile I-35,” The History Channel website, http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35 (accessed May 22, 2013).
Leif Erickson Tunnel completes 1,593-mile I-35 [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35.
Leif Erickson Tunnel completes 1,593-mile I-35, http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35 (last visited May 22, 2013).
Leif Erickson Tunnel completes 1,593-mile I-35. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/leif-erickson-tunnel-completes-1593-mile-i-35. Accessed May 22, 2013.