Jim DeRogatis: Turn on Your Mind. Four Decades of Psychedelic Rock. Hal Leonard Corporation, Milwaukee 2003, ISBN 0-634-05548-8, S. 167 (Online-Vorschau).
Edward Macan: Rocking the Classics. English Progressive Rock and the Counterculture. Oxford University Press, Oxford/New York 1997, ISBN 0-19-509887-0, S. 21 (Online-Vorschau).
George Case: Out of Our Heads. Rock ‘n’ Roll Before the Drugs Wore Off. Backbeat Books, New York 2010, ISBN 978-0-87930-967-1, S. 75 (Online-Vorschau).
Michael Long: Beautiful Monsters. Imagining the Classic in Musical Media (= California studies in 20th-century music. Band 10). University of California Press, Berkeley/Los Angeles 2008, ISBN 978-0-520-22897-9, S. 133 (Online-Vorschau).
Tobias Bücklein: Switched-On Bach. Bearbeitungen der Werke Johann Sebastian Bachs im Bereich von Jazz, Rock und Popmusik. Wissenschaftliche Zulassungsarbeit, Trossingen 1993, S. 37 ff. (Online-Vorschau).