8Roland T. Rust and Naveen Donthu. " A Programming and Positioning Strategy for Cable Television Networks". Journal of Advertising, 1998, Vol. 17, No. 4 : 6 - 13.
9Ian Darby. "ESPN Goes to the X - treme for a Global presence". Campaign, Aug 24,2007. pg 17.
10Monte Burke, "X- treme Economics", Forbes New York , 2004, Vol. 173,Iss. 2:40 -42.