Electric guitar (English Wikipedia)

"Stringed Instrument (Tremolo)". Google Patents. USPTO. Retrieved 8 August 2016.
"Electric Stringed Musical Instrument". google.patents. USPTO. Retrieved 8 August 2016.
"Apparatus for producing tremolo effects". US Patent Trade Mark Office. USPTO. Retrieved 21 July 2018.

premierguitar.com

Ross, Michael (17 November 2011). "Forgotten Heroes: Paul Bigsby". Premier Guitar. Retrieved 19 October 2015.

Lemme, Helmuth (25 February 2009). "The Secrets of Electric Guitar Pickups" (PDF). Build Your Guitar. Electronic Musician. Archived from the original (PDF) on 27 April 2016. Retrieved 15 April 2016 – via Electric Guitar Pickup, Joseph Henry Project.

"An Important and Historical Instrument". Retrofret Vintage Guitars. Retrofret. Retrieved 16 March 2017.
"Rickenbacker Ken Roberts Model Hollow Body Electric Guitar". Retrofret.com. Retrieved 21 July 2018.

Maloof, Rich (28 June 2017). "Who Really Invented the Electric Guitar". Reverb.com. Retrieved 21 July 2018.

"The Earliest Days of the Electric Guitar". Rickenbacker. RIC. Archived from the original on 24 December 2005. Retrieved 8 August 2015.

"Invention: Electric Guitar". www.invention.si.edu. Lemelson Center for the Study of Invention and Innovation. Archived from the original on 24 August 2018. Retrieved 21 July 2018.
"Invention". Lemelson Center for the Study of Invention and Innovation. 18 April 2014. Retrieved 8 December 2019.

"Scale Length Explained". StewMac. Archived from the original on 24 July 2019. Retrieved 24 July 2019.

"Electric Guitar (Les Paul model) by Gibson, Inc., Kalamazoo, 1952". National Music Museum. The University of South Dakota. Archived from the original on 14 November 2012. Retrieved 8 November 2012.

"Guitar E – berichte und fotos". viewgoods.de. Archived from the original on 25 October 2011. Retrieved 18 May 2011.

Wheelwright, Lynn; Carter, Walter (28 April 2010). [1]. Vintage Guitar. Retrieved 10 July 2014.

"Invention: Electric Guitar". www.invention.si.edu. Lemelson Center for the Study of Invention and Innovation. Archived from the original on 24 August 2018. Retrieved 21 July 2018.
"Guitar E – berichte und fotos". viewgoods.de. Archived from the original on 25 October 2011. Retrieved 18 May 2011.
"The Earliest Days of the Electric Guitar". Rickenbacker. RIC. Archived from the original on 24 December 2005. Retrieved 8 August 2015.
"Does my Les Paul have weight relief holes or sound chambers?". lespaulforum.com. Archived from the original on 26 August 2010. Retrieved 1 February 2008.
"Electric Guitar (Les Paul model) by Gibson, Inc., Kalamazoo, 1952". National Music Museum. The University of South Dakota. Archived from the original on 14 November 2012. Retrieved 8 November 2012.
Lemme, Helmuth (25 February 2009). "The Secrets of Electric Guitar Pickups" (PDF). Build Your Guitar. Electronic Musician. Archived from the original (PDF) on 27 April 2016. Retrieved 15 April 2016 – via Electric Guitar Pickup, Joseph Henry Project.
"Scale Length Explained". StewMac. Archived from the original on 24 July 2019. Retrieved 24 July 2019.