1. A History of Rock Climbing Gear Technology and Standards, Mechanical Engineering Undergraduate Honors Theses 41;Bright,2014
2. T. Evans S. Truebe A Review of Webbing Anchor Research 2015 International Technical Rescue Symposium, Portland, Oregon
3. Clean Climbing, Carabiners, and Cultural Cultivation: Developing an Open-Systems Perspective of Culture
4. “Climbing Dictionary & Glossary”, http://www.mountaindays.net/, Archived from the original on 2007-01-03, Retrieved 2006-12-05.