Carmichael, A. Ron (24 June 2001). "Archer's Paradox". texasarchery.org. Texas State Archery Association. Archived from the original on 20 October 2013. Retrieved 13 February 2013.
"Jim Hill's Spine Tester". texasarchery.org. Texas State Archery Association. Archived from the original on 20 October 2013. Retrieved 13 February 2013.
Carmichael, A. Ron (24 June 2001). "Archer's Paradox". texasarchery.org. Texas State Archery Association. Archived from the original on 20 October 2013. Retrieved 13 February 2013.
"Jim Hill's Spine Tester". texasarchery.org. Texas State Archery Association. Archived from the original on 20 October 2013. Retrieved 13 February 2013.
"Arrow Spine Information"(PDF). yeoldedelphbowmen.com. December 2012. Archived from the original(PDF) on 20 October 2013. Retrieved 13 February 2013.
yeoldedelphbowmen.com
"Arrow Spine Information"(PDF). yeoldedelphbowmen.com. December 2012. Archived from the original(PDF) on 20 October 2013. Retrieved 13 February 2013.
youtube.com
Yononindo, Daniel (2 February 2012). Archers Paradox up to the Limit !!! Extended Version. Event occurs at 6m15s – via YouTube. The breaking of the arrow at the end of the video was NOT due to a lack of knowledge on my part !!! IT WAS QUITE DELIBERATE !!!