Senft, Michael (6 July 2006). "Warped Tour a hit in new digs". The Arizona Republic. Gannett Company. Retrieved 21 December 2022. Early arrivals were able to see experimental metal pioneers Helmet as well as retro punks the Casualties.
books.google.com
Christe, Ian (2004). Sound of the Beast: The Complete Headbanging History of Heavy Metal. Harper Paperbacks. p. 253. ISBN0380811278. Retrieved 21 December 2022.
Peterik, Jim; Austin, Dave; Austin, Cathy & Lynn, Cathy (2 August 2010). Songwriting for Dummies (2nd ed.). John Wiley & Sons. p. 37. ISBN978-0470615140. Retrieved 21 December 2022.
nytimes.com
Wray, John (28 May 2006). "Heady Metal". New York Times. Retrieved 21 December 2022.