- https://www.youtube.com/watch?v=AfQvw5Li-cM
- https://www.youtube.com/watch?v=wAe42wChYmY
- http://www.tallenj.us/
- https://www.flickr.com/photos/ultravioletasounds/422270323/in/dateposted/
- https://www.youtube.com/watch?v=tE-aSX_ayQY
- https://go.gx7golf.com/get/gx7xmetal/