NFPA 1932 Standard on Use, Maintenance, and Service Testing of In-Service Fire Department Ground Ladders, 2004 ed. http://www.nfpa.org/assets/files/AboutTheCodes/193 1/1931-A2004-ROP.pdf, (Std: Use, Maint and Srvc Tst of In-Srvc Fr Dept Gr Ladr - Amer) {420 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}