NFPA 1983 Standard on Fire Service Life Safety Rope and System Components, 2001 ed. http://www.nfpa.org/assets/files/AboutTheCodes/198 3/1983-F2005-ROP.pdf, (Std: Fr Srvc Life Sfty Rope and Sys Components - Amer) {434 NFC}
National Fire Protection Association, Illustrated Dictionary of Fire Service Terms, Jones & Bartlett Publishers, MA. USA 2006. https://books.google.com.kw/books?id=W0WIRa3Gl4QC& printsec=frontcover&source=gbs_ge_summary_r&cad=0# v=onepage&q&f=false, (Fr Srvc - Amer) {141}