^Colin Larkin. The Guinness Encyclopedia of Popular Music: Threepenny Opera to ZZ Top. Volume 6. Guinness Publications (1995). p. 4470.
^ abJoynson, Vernon. The Tapestry of Delights - The Comprehensive Guide to British Music of the Beat, R&B, Psychedelic and Progressive Eras. Borderline. p. 928.
Joynson, Vernon. The Tapestry of Delights - The Comprehensive Guide to British Music of the Beat, R&B, Psychedelic and Progressive Eras 1963-1976. Borderline (2006). Reprinted (2008).ISBN189-98-55157
Larkin Colin. The Guinness Encyclopedia of Popular Music: Threepenny Opera to ZZ Top