1. Ashley, C. W. (1944). The Ashley book of knots (Vol. 13). Doubleday Books.
2. Evans, T. (2016). “A Review of Knot Strength Testing”, in: Int. Techn. Rescue Symp
3. EN 361 (832620). (2003). Personal protective equipment against falls from a height - Full body harnesses. European Committee for Standardization. Brussel.
4. EN 362 (832623). (2005). Personal protective equipment against falls from a height - Connectors. European Committee for Standardization. Brussel.
5. EN 365 (832601). (2005). Personal protective equipment against falls from a height - General requirements for instructions for use, maintenance, periodic examination, repair, marking and packaging. European Committee for Standardization. Brussel.