Geezer Butler (Simple English Wikipedia)

Ankeny, Jason. "Biography–Geezer Butler". Allmusic. Retrieved 22 January 2010.
"Overview Black Science". Allmusic. Retrieved 22 January 2010.
Jeffries, Vincent. "Overview Plastic Planet". Allmusic. Retrieved 22 January 2010.
Monger, James Christopher. "Biography-Heaven & Hell". Allmusic. Retrieved 22 January 2010.

ampeg.com

"Artist profile-Geezer Butler". Ampeg. Archived from the original on 26 August 2010. Retrieved 22 January 2010.

"Interview with Bassist Steve Di Giorgio". bassmusicianmagazine.com. October 2011. Archived from the original on 16 April 2015. Retrieved 26 January 2014.

Osbourne, Ozzy (2011). I Am Ozzy. I Am Ozzy. p. 134. ISBN 9780446573139. Retrieved 24 May 2013.

"John Myung: Exclusive interview with FBPO's Jon Liebman". Forbassplayersonly.com. 31 March 2014. Archived from the original on 5 April 2014. Retrieved 8 May 2014.
"Greg Smith interview". forbassplayersonly.com. Archived from the original on 2 February 2014. Retrieved 26 January 2014.

"Photos :: The Official Geezer Butler Website". Geezerbutler.com. 5 December 2012. Retrieved 9 December 2012.

"Geezer Butler Appears in Peta Ad as a Confirmed Vegan". Guitar World. 28 April 2009. Retrieved 30 September 2011. [...] teamed up with peta2 [...] to shoot a brand-new pro-vegetarian ad featuring Butler [...] next to the tagline "I'm Geezer Butler, and I'm a Vegan."

"Les Claypool interview". jensmetalpage.com. Archived from the original on 28 August 2010. Retrieved 26 January 2014.

"Artist profile-Geezer Butler". Lakland. Archived from the original on 2 February 2012. Retrieved 22 January 2010.

"Black Sabbath goes back to its roots". Montrealgazette.com. 7 April 2014. Archived from the original on 12 July 2020. Retrieved 24 August 2014.

"Interview: Cannibal Corpse". painkillermag.com. Archived from the original on 2 February 2014. Retrieved 26 January 2014.

Barrett, John. "The 20 Most Underrated Bass Guitarists". Paste Monthly. Archived from the original on 12 July 2015. Retrieved 4 April 2016.

Hotten, Jon. "The Dio Years" (PDF). Archived from the original (PDF) on 24 January 2009. Retrieved 13 June 2013.

"Interview with Johnny Lee Middleton". savatage.com. Archived from the original on 4 February 2014. Retrieved 26 January 2014.

Barrett, John. "The 20 Most Underrated Bass Guitarists". Paste Monthly. Archived from the original on 12 July 2015. Retrieved 4 April 2016.
"Artist profile-Geezer Butler". Ampeg. Archived from the original on 26 August 2010. Retrieved 22 January 2010.
"Black Sabbath goes back to its roots". Montrealgazette.com. 7 April 2014. Archived from the original on 12 July 2020. Retrieved 24 August 2014.
Hotten, Jon. "The Dio Years" (PDF). Archived from the original (PDF) on 24 January 2009. Retrieved 13 June 2013.
"Les Claypool interview". jensmetalpage.com. Archived from the original on 28 August 2010. Retrieved 26 January 2014.
"Interview with Bassist Steve Di Giorgio". bassmusicianmagazine.com. October 2011. Archived from the original on 16 April 2015. Retrieved 26 January 2014.
"Interview: Cannibal Corpse". painkillermag.com. Archived from the original on 2 February 2014. Retrieved 26 January 2014.
"John Myung: Exclusive interview with FBPO's Jon Liebman". Forbassplayersonly.com. 31 March 2014. Archived from the original on 5 April 2014. Retrieved 8 May 2014.
"Interview with Johnny Lee Middleton". savatage.com. Archived from the original on 4 February 2014. Retrieved 26 January 2014.
"Greg Smith interview". forbassplayersonly.com. Archived from the original on 2 February 2014. Retrieved 26 January 2014.

"Artist profile-Geezer Butler". Lakland. Archived from the original on 2 February 2012. Retrieved 22 January 2010.