Silverman, Dave (1998–1999). "Interview: Douglas Adams". American Atheist. 37 (1). Archived from the original on 18 December 2011. Retrieved 16 August 2009.
Botti, Nicholas. "Interview with Frank Halford". Life, DNA, and H2G2. 2009. Web. Retrieved 13 March 2012. (Click on link at bottom for facsimile page from Daily News article, 7 March 1998.)
“Douglas Adams.” Private Passions, hosted by Michael Berkeley, BBC Radio 3, 13 September 1997. "I would have loved to have been a rock musician. A couple of years ago I had an enormous extraordinary treat. I got to play one song live on stage with Pink Floyd at Earls Court..."
Silverman, Dave (1998–1999). "Interview: Douglas Adams". American Atheist. 37 (1). Archived from the original on 18 December 2011. Retrieved 16 August 2009.
Roberts 2015, pp. 129–130. Roberts, Jem (10 September 2015). The Frood: The Authorised and Very Official Biography of Douglas Adams & The Hitchhiker's Guide to the Galaxy. London: Arrow Books. ISBN978-0-09-959076-7. OCLC920836076.