Wood, Mikael (11 April 2009). "R.O.O.T.S."Billboard. Nielsen Business Media, Inc. Archived from the original on May 10, 2009. Retrieved 24 December 2009.
Wood, Mikael (11 April 2009). "R.O.O.T.S."Billboard. Nielsen Business Media, Inc. Archived from the original on May 10, 2009. Retrieved 24 December 2009.