(en) Eilon Paz, Stompbox: 100 Pedals of the World's Greatest Guitarists, Clarkson Potter/Ten Speed, (ISBN978-1-9848-6061-3, lire en ligne), p. 456
(en) Guitar World, Guitar World Presents 200 Stompbox Reviews, Hal Leonard Corporation, , 304 p. (ISBN978-1-4803-9847-4, lire en ligne), « DigiTech 5th Generation Whammy Pedal »
(en) Introduction to Guitar Tone & Effects: An Essential Manual for Getting the Best Sounds from Electric Guitars, Amplifiers, Effect Pedals, and Digital Processors, Hal Leonard Corporation (ISBN978-1-61774-375-7, lire en ligne), p. 39