1. American National Standard for Ladders – Portable Metal – Safety Requirements;ANSI A14,2017
2. Biomechanical aspects of fixed ladder climbing: style, ladder tilt and carrying;Armstrong,2009
3. Climbing biomechanics;Bloswick,1999
4. An ergonomic analysis of the ladder climbing activity;Bloswick;Int. J. Ind. Ergon.,1990
5. Chapter 11. Correlation and regression;Campbell,2009