Berelian, Essi, "The Rough Guide To Heavy-Metal" (2005), pp. 102 "Disturbed Biography from 2004's The New Rolling Stone Album Guide".
Berelian, Essi, „The Rough Guide to Heavy Metal“ (2005), pp. 102 Disturbed Biography from 2004's The New Rolling Stone Album Guide (неопр.) (недоступная ссылка).