"Top 25 Tours of 2011". Billboard. Prometheus Global Media. 8 December 2011. Archived from the original on 27 December 2011. Retrieved 27 December 2011.
"Top 25 Tours of 2011". Billboard. Prometheus Global Media. 8 December 2011. Archived from the original on 27 December 2011. Retrieved 27 December 2011.