"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: 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.