Julie Webb: The contents of Freddie Mercury’s pants are his alone. In: New Musical Express, 2. November 1974, S. 39. (siehe z. B. reocities.com (Memento vom 17. November 2015 im Internet Archive))
Brian May: Additional Note Deacy Amp History. (Memento vom 13. Juli 2007 im Internet Archive) In: Bri’s Soapbox, 30. Juni 2005. („[…] John Deacon did himself use the Amp with excellent effect – on Misfire (on the Sheer Heart Attack album) – in which John played all his own guitar harmonies! All, that is, until I joined in at the end, doing ‘answering’ harmonies for the coda, into a keychange and then a fade.“)
